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CVE-2026-49338

Subsonic API: any authenticated user can delete or read any other user's playlist (IDOR)

7.1 HighFix available

gonic is a music streaming server / free-software subsonic server API implementation. Prior to version 0.21.0, the Subsonic API endpoints /rest/deletePlaylist.view and /rest/getPlaylist.view perform no per-resource authorization. Once authenticated as any user (admin or not), an attacker can delete any playlist owned by any other user (including admin) by passing its id and read the full contents (name, comment, song list) of any other user's private (non-public) playlist by passing its id. The Subsonic playlist id is base64url("<userID>/<filename>.m3u"). Because filenames are user-supplied or time-derived and the userID is a small integer, IDs are guessable and frequently exposed (e.g. a previously-public playlist that was later made private still has the same ID). This breaks the multi-user trust boundary of gonic: a low-privileged user can wipe an administrator's curated playlists, and a user can exfiltrate any private playlist they obtain an ID for. The issue was fixed in commit 6dd71e6a3c966867ef8c900d359a7df75789f410, which is part of version 0.21.0.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
High
Availability
None

Exploit likelihood

0.29%Up 0.1 points since Jun 23, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.1

Subsonic API: any authenticated user can delete or read any other user's playlist (IDOR)

gonic is a music streaming server / free-software subsonic server API implementation. Prior to version 0.21.0, the Subsonic API endpoints /rest/deletePlaylist.view and /rest/getPlaylist.view perform no per-resource authorization. Once authenticated as any user (admin or not), an attacker can delete any playlist owned by any other user (including admin) by passing its id and read the full contents (name, comment, song list) of any other user's private (non-public) playlist by passing its id. The Subsonic playlist id is base64url("<userID>/<filename>.m3u"). Because filenames are user-supplied or time-derived and the userID is a small integer, IDs are guessable and frequently exposed (e.g. a previously-public playlist that was later made private still has the same ID). This breaks the multi-user trust boundary of gonic: a low-privileged user can wipe an administrator's curated playlists, and a user can exfiltrate any private playlist they obtain an ID for. The issue was fixed in commit 6dd71e6a3c966867ef8c900d359a7df75789f410, which is part of version 0.21.0.

Record
CVE-2026-49338
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Weakness
CWE-285, CWE-639
Updated
2026-11-02
EUVDEUVD-2026-38067 7.1

gonic is a music streaming server / free-software subsonic server API implementation. Prior to version 0.21.0, the Subsonic API endpoints /rest/deletePlaylist.view and /rest/getPlaylist.view perform no per-resource authorization. Once authenticated as any user (admin or not), an attacker can delete any playlist owned by any other user (including admin) by passing its id and read the full contents (name, comment, song list) of any other user's private (non-public) playlist by passing its id. The Subsonic playlist id is base64url("<userID>/<filename>.m3u"). Because filenames are user-supplied or time-derived and the userID is a small integer, IDs are guessable and frequently exposed (e.g. a previously-public playlist that was later made private still has the same ID). This breaks the multi-user trust boundary of gonic: a low-privileged user can wipe an administrator's curated playlists, and a user can exfiltrate any private playlist they obtain an ID for. The issue was fixed in commit 6dd71e6a3c966867ef8c900d359a7df75789f410, which is part of version 0.21.0.

Record
EUVD-2026-38067
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-hmgp-w9jm-vp95 7.1

Subsonic API: any authenticated user can delete or read any other user's playlist (IDOR)

Summary

In gonic, the Subsonic API endpoints /rest/deletePlaylist.view and /rest/getPlaylist.view perform no per-resource authorization. Once authenticated as any user (admin or not), an attacker can:

  1. Delete any playlist owned by any other user (including admin) by passing its id.
  2. Read the full contents (name, comment, song list) of any other user's private (non-public) playlist by passing its id.

The Subsonic playlist id is base64url("<userID>/<filename>.m3u"). Because filenames are user-supplied or time-derived and the userID is a small integer, IDs are guessable and frequently exposed (e.g. a previously-public playlist that was later made private still has the same ID).

This breaks the multi-user trust boundary of gonic: a low-privileged user can wipe an administrator's curated playlists, and a user can exfiltrate any private playlist they obtain an ID for.

Status

This was originally disclosed to the maintainer by email and has been fixed in commit 6dd71e6a3c966867ef8c900d359a7df75789f410 (fix(subsonic): enforce playlist ownership on getPlaylist/deletePlaylist, 2026-05-18). The fix has not yet been included in a tagged release; the latest tagged version v0.20.1 is still vulnerable. Filing this advisory now that private vulnerability reporting is enabled on the repo, so the issue has a public record once the next release ships.

Vulnerable code (pre-fix, at v0.20.1 / commit 37090aa7)

Delete IDOR — server/ctrlsubsonic/handlers_playlist.go lines 177-187:

func (c *Controller) ServeDeletePlaylist(r *http.Request) *spec.Response {
    params := r.Context().Value(CtxParams).(params.Params)
    playlistID, err := params.GetFirstID("id", "playlistId")
    if err != nil {
        return spec.NewError(10, "please provide an `id` or `playlistId` parameter")
    }
    if err := c.playlistStore.Delete(playlistIDDecode(playlistID)); err != nil {
        return spec.NewError(0, "delete playlist: %v", err)
    }
    return spec.NewResponse()
}

The handler never loads the playlist to check playlist.UserID == user.ID. Compare to ServeUpdatePlaylist (same file, line 138) which does perform this check.

Read IDOR — server/ctrlsubsonic/handlers_playlist.go lines 51-68:

func (c *Controller) ServeGetPlaylist(r *http.Request) *spec.Response {
    params := r.Context().Value(CtxParams).(params.Params)
    playlistID, err := params.GetFirstID("id", "playlistId")
    if err != nil {
        return spec.NewError(10, "please provide an `id` parameter")
    }
    playlist, err := c.playlistStore.Read(playlistIDDecode(playlistID))
    if err != nil {
        return spec.NewError(70, "playlist with id %s not found", playlistID)
    }
    // ... never checks playlist.UserID or playlist.IsPublic ...
    sub.Playlist = rendered
    return sub
}

The listing endpoint ServeGetPlaylists (line 38) correctly filters by playlist.UserID != user.ID && !playlist.IsPublic, but the singular getPlaylist did not.

Live PoC (passing Go test)

A reproducer against the existing test fixture (server/ctrlsubsonic):

func TestIDOR_DeleteOtherUsersPlaylist(t *testing.T) {
    f := newFixture(t)
    victimRelPath := filepath.Join("1", "victim-private.m3u")
    _ = f.contr.playlistStore.Write(victimRelPath, &playlistp.Playlist{
        UserID: f.admin.ID, Name: "victim-private", IsPublic: false,
        Items: []string{"/music/foo.flac"},
    })
    victimID := playlistIDEncode(victimRelPath).String()
    // f.alt is a non-admin, non-owner user
    body := f.query(t, f.contr.ServeDeletePlaylist, f.alt, url.Values{"id": {victimID}})
    // Subsonic returns status="ok" and the file is gone.
}

Test output:

--- PASS: TestIDOR_ReadOtherUsersPrivatePlaylist (0.07s)
--- PASS: TestIDOR_DeleteOtherUsersPlaylist (0.07s)
PASS
ok  go.senan.xyz/gonic/server/ctrlsubsonic 0.730s

Equivalent HTTP request

GET…
Record
GHSA-hmgp-w9jm-vp95
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Weakness
CWE-285, CWE-639
Updated
2026-11-02
NVD 7.1

gonic is a music streaming server / free-software subsonic server API implementation. Prior to version 0.21.0, the Subsonic API endpoints /rest/deletePlaylist.view and /rest/getPlaylist.view perform no per-resource authorization. Once authenticated as any user (admin or not), an attacker can delete any playlist owned by any other user (including admin) by passing its id and read the full contents (name, comment, song list) of any other user's private (non-public) playlist by passing its id. The Subsonic playlist id is base64url("<userID>/<filename>.m3u"). Because filenames are user-supplied or time-derived and the userID is a small integer, IDs are guessable and frequently exposed (e.g. a previously-public playlist that was later made private still has the same ID). This breaks the multi-user trust boundary of gonic: a low-privileged user can wipe an administrator's curated playlists, and a user can exfiltrate any private playlist they obtain an ID for. The issue was fixed in commit 6dd71e6a3c966867ef8c900d359a7df75789f410, which is part of version 0.21.0.

Record
CVE-2026-49338
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Weakness
CWE-285, CWE-639
Updated
2026-11-02
OSV 7.1

Subsonic API: any authenticated user can delete or read any other user's playlist (IDOR)

gonic is a music streaming server / free-software subsonic server API implementation. Prior to version 0.21.0, the Subsonic API endpoints /rest/deletePlaylist.view and /rest/getPlaylist.view perform no per-resource authorization. Once authenticated as any user (admin or not), an attacker can delete any playlist owned by any other user (including admin) by passing its id and read the full contents (name, comment, song list) of any other user's private (non-public) playlist by passing its id. The Subsonic playlist id is base64url("<userID>/<filename>.m3u"). Because filenames are user-supplied or time-derived and the userID is a small integer, IDs are guessable and frequently exposed (e.g. a previously-public playlist that was later made private still has the same ID). This breaks the multi-user trust boundary of gonic: a low-privileged user can wipe an administrator's curated playlists, and a user can exfiltrate any private playlist they obtain an ID for. The issue was fixed in commit 6dd71e6a3c966867ef8c900d359a7df75789f410, which is part of version 0.21.0.

Record
CVE-2026-49338
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Weakness
CWE-285, CWE-639
Updated
2026-11-02
OSVGHSA-hmgp-w9jm-vp95 7.1

Subsonic API: any authenticated user can delete or read any other user's playlist (IDOR)

Summary

In gonic, the Subsonic API endpoints /rest/deletePlaylist.view and /rest/getPlaylist.view perform no per-resource authorization. Once authenticated as any user (admin or not), an attacker can:

  1. Delete any playlist owned by any other user (including admin) by passing its id.
  2. Read the full contents (name, comment, song list) of any other user's private (non-public) playlist by passing its id.

The Subsonic playlist id is base64url("<userID>/<filename>.m3u"). Because filenames are user-supplied or time-derived and the userID is a small integer, IDs are guessable and frequently exposed (e.g. a previously-public playlist that was later made private still has the same ID).

This breaks the multi-user trust boundary of gonic: a low-privileged user can wipe an administrator's curated playlists, and a user can exfiltrate any private playlist they obtain an ID for.

Status

This was originally disclosed to the maintainer by email and has been fixed in commit 6dd71e6a3c966867ef8c900d359a7df75789f410 (fix(subsonic): enforce playlist ownership on getPlaylist/deletePlaylist, 2026-05-18). The fix has not yet been included in a tagged release; the latest tagged version v0.20.1 is still vulnerable. Filing this advisory now that private vulnerability reporting is enabled on the repo, so the issue has a public record once the next release ships.

Vulnerable code (pre-fix, at v0.20.1 / commit 37090aa7)

Delete IDOR — server/ctrlsubsonic/handlers_playlist.go lines 177-187:

func (c *Controller) ServeDeletePlaylist(r *http.Request) *spec.Response {
    params := r.Context().Value(CtxParams).(params.Params)
    playlistID, err := params.GetFirstID("id", "playlistId")
    if err != nil {
        return spec.NewError(10, "please provide an `id` or `playlistId` parameter")
    }
    if err := c.playlistStore.Delete(playlistIDDecode(playlistID)); err != nil {
        return spec.NewError(0, "delete playlist: %v", err)
    }
    return spec.NewResponse()
}

The handler never loads the playlist to check playlist.UserID == user.ID. Compare to ServeUpdatePlaylist (same file, line 138) which does perform this check.

Read IDOR — server/ctrlsubsonic/handlers_playlist.go lines 51-68:

func (c *Controller) ServeGetPlaylist(r *http.Request) *spec.Response {
    params := r.Context().Value(CtxParams).(params.Params)
    playlistID, err := params.GetFirstID("id", "playlistId")
    if err != nil {
        return spec.NewError(10, "please provide an `id` parameter")
    }
    playlist, err := c.playlistStore.Read(playlistIDDecode(playlistID))
    if err != nil {
        return spec.NewError(70, "playlist with id %s not found", playlistID)
    }
    // ... never checks playlist.UserID or playlist.IsPublic ...
    sub.Playlist = rendered
    return sub
}

The listing endpoint ServeGetPlaylists (line 38) correctly filters by playlist.UserID != user.ID && !playlist.IsPublic, but the singular getPlaylist did not.

Live PoC (passing Go test)

A reproducer against the existing test fixture (server/ctrlsubsonic):

func TestIDOR_DeleteOtherUsersPlaylist(t *testing.T) {
    f := newFixture(t)
    victimRelPath := filepath.Join("1", "victim-private.m3u")
    _ = f.contr.playlistStore.Write(victimRelPath, &playlistp.Playlist{
        UserID: f.admin.ID, Name: "victim-private", IsPublic: false,
        Items: []string{"/music/foo.flac"},
    })
    victimID := playlistIDEncode(victimRelPath).String()
    // f.alt is a non-admin, non-owner user
    body := f.query(t, f.contr.ServeDeletePlaylist, f.alt, url.Values{"id": {victimID}})
    // Subsonic returns status="ok" and the file is gone.
}

Test output:

--- PASS: TestIDOR_ReadOtherUsersPrivatePlaylist (0.07s)
--- PASS: TestIDOR_DeleteOtherUsersPlaylist (0.07s)
PASS
ok  go.senan.xyz/gonic/server/ctrlsubsonic 0.730s

Equivalent HTTP request

GET…
Record
GHSA-hmgp-w9jm-vp95
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Weakness
CWE-285, CWE-639
Updated
2026-11-02
OSVGO-2026-5830 No score

Subsonic API: any authenticated user can delete or read any other user's playlist (IDOR) in go.senan.xyz/gonic

Subsonic API: any authenticated user can delete or read any other user's playlist (IDOR) in go.senan.xyz/gonic

Record
GO-2026-5830
Updated
2026-11-02
OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
  • GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
  • GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
  • GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
  • GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
  • GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
  • GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
  • GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
  • GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
  • GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
  • GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
  • GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
  • GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
  • GO-2026-5933 GHSA-3g4q-2f67-2gvh
  • GO-2026-5934 GHSA-59qp-cfj3-rp64
  • GO-2026-5935 GHSA-7856-g3gv-9wq8
  • GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
  • GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
  • GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
  • GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
  • GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
  • GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
  • GO-2026-5942 CVE-2026-46600
  • GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
  • GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
  • GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
  • GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
  • GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
  • GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
  • GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
  • GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
  • GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
  • GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
  • GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
  • GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
  • GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
  • GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
  • GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
  • GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
  • GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
  • GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
  • GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
  • GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
  • GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
  • GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
  • GO-2026-5969 GHSA-g936-7jqj-mwv8
  • GO-2026-5970 CVE-2026-56852
  • GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
  • GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
  • GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
  • GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
  • GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
  • GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
  • GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
  • GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
  • GO-2026-5981 GHSA-mqxv-9rm6-w8qc
  • GO-2026-5982 GHSA-pqg7-v6wh-3pfp
  • GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
  • GO-2026-5985 GHSA-7rx3-5wx3-5v76
  • GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
  • GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
  • GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
  • GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
  • GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
  • GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
  • GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
  • GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
  • GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
  • GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
  • GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
  • GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
  • GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
  • GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
  • GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
  • GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…
Record
openSUSE-SU-2026:21483-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
go.senan.xyz/gonic
Go
 through 0.20.1
0.21.0
go.senan.xyz/gonic
Go
 before 0.21.0
0.21.0
govulncheck-vulndb
openSUSE:Leap 16.0
From an advisory covering 1734 CVEs
 before 0.0.20260723T184607-160000.1.1
0.0.20260723T184607-160000.1.1

History

History
RecordedChangedSources
affected, facts
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-49338 is a high vulnerability (CVSS 7.1) in Sentriz Gonic, published June 19, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.29%, the 21st percentile. Fixed in go.senan.xyz/gonic 0.21.0.

References

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