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CVE-2026-54562

Cloudreve: Non-admin remote download users can SSRF loopback/internal services and read imported responses

6.5 MediumFix available

Cloudreve is a self-hosted file management and sharing system. Prior to 4.16.1, Cloudreve's remote download workflow accepts user-supplied URLs at POST /api/v4/workflow/download and passes them to the configured downloader without blocking loopback, localhost, IPv6 localhost, or redirect-to-loopback targets, allowing a non-admin user with remote download permission to fetch internal-only URLs and read the response after it is imported into the user's own files. This issue is fixed in version 4.16.1.

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
High
Integrity
None
Availability
None

Exploit likelihood

0.40%Up 0.2 points since Jul 16, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.5

Cloudreve: Non-admin remote download users can SSRF loopback/internal services and read imported responses

Cloudreve is a self-hosted file management and sharing system. Prior to 4.16.1, Cloudreve's remote download workflow accepts user-supplied URLs at POST /api/v4/workflow/download and passes them to the configured downloader without blocking loopback, localhost, IPv6 localhost, or redirect-to-loopback targets, allowing a non-admin user with remote download permission to fetch internal-only URLs and read the response after it is imported into the user's own files. This issue is fixed in version 4.16.1.

Record
CVE-2026-54562
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-918
Updated
2026-11-02
EUVDEUVD-2026-44687 6.5

Cloudreve is a self-hosted file management and sharing system. Prior to 4.16.1, Cloudreve's remote download workflow accepts user-supplied URLs at POST /api/v4/workflow/download and passes them to the configured downloader without blocking loopback, localhost, IPv6 localhost, or redirect-to-loopback targets, allowing a non-admin user with remote download permission to fetch internal-only URLs and read the response after it is imported into the user's own files. This issue is fixed in version 4.16.1.

Record
EUVD-2026-44687
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-x756-g4x3-c64m 6.5

Cloudreve: Non-admin remote download users can SSRF loopback/internal services and read imported responses

Summary

Cloudreve's remote download workflow accepts user-supplied URLs and passes them to the configured downloader without blocking loopback, localhost, IPv6 localhost, or redirect-to-loopback targets.

When the remote download permission is granted to a non-admin user group, a normal authenticated user can make the server-side downloader fetch internal-only URLs and then read the fetched response after it is imported into the user's own Cloudreve files.

This does not affect default normal users unless the remote download permission is enabled for their group. However, the permission is a feature-level user-group capability and does not make the user an administrator.

Attacker requirements

The attacker must be:

  • authenticated
  • non-admin
  • in a user group where GroupPermissionRemoteDownload is enabled

Default normal users are blocked from the affected workflow. In the default install, only the admin group has the remote download permission, while the default User group does not.

Affected endpoint

POST /api/v4/workflow/download

Follow-up attacker readback was performed through normal workflow and file APIs:

GET /api/v4/workflow?category=downloaded...
GET /api/v4/file?uri=cloudreve://my...
POST /api/v4/file/url

Root cause

The remote download workflow checks whether the user group has remote download permission, but it does not validate the submitted URL before passing it to the downloader.

Relevant code paths:

  • service/explorer/workflows.go:81
  • pkg/filemanager/workflows/remote_download.go:202
  • pkg/downloader/aria2/aria2.go:56

The application does not block loopback, localhost, IPv6 localhost, or redirect targets resolving to internal addresses.

Impact

A non-admin user with remote download permission can use Cloudreve as an SSRF primitive to access services reachable from the downloader environment.

In my test, the attacker could fetch internal loopback URLs and read the response body after Cloudreve imported the downloaded content into the attacker's own files.

Confirmed targets:

  • http://127.0.0.1:7777/secret2
  • http://localhost:7777/localsecret
  • http://[::1]:7780/v6secret
  • redirect to http://127.0.0.1:7777/redirsecret

This can expose internal HTTP services, loopback-only admin panels, local service metadata, or other network resources that are not directly reachable by the attacker.

Reproduction

1. Permission negative control

The attacker is a normal non-admin user in the default User group.

Before enabling remote download for the group:

POST /api/v4/workflow/download
Content-Type: application/json

{"src":["http://127.0.0.1:7777/secret"],"dst":"cloudreve://my"}

Response:

{"code":40007,"msg":"Group not allowed to download files"}

2. Enable only remote download permission for the non-admin group

The default install grants remote download to the admin group only. The default User group does not have it.

Confirmed in:

  • inventory/migration.go:154
  • inventory/migration.go:179

For this test, I only changed group 2 permissions from:

hAg=

to:

hAo=

The attacker remained in the User group and was not made admin. GET /api/v4/user/me still returned the group name as User.

3. Start an internal listener

Example listener on the Cloudreve host:

127.0.0.1:7777

The listener returned a marker response:

SSRF_SECRET_2_20260527

4. Queue a remote download to loopback

POST /api/v4/workflow/download
Content-Type: application/json

{"src":["http://127.0.0.1:7777/secret2"],"dst":"cloudreve://my"}

Response:

{"code":0,"data":[{"id":"OzH4","status":"queued","type":"remote_download"}]}

The internal listener received the request:

127.0.0.1 - - [27/May/2026 13:00:46] "GET /secret2 HTTP/1.1" 200 -

Aria2 completed the download:

Download complete:…
Record
GHSA-x756-g4x3-c64m
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-918
Updated
2026-11-02
NVD 6.5

Cloudreve is a self-hosted file management and sharing system. Prior to 4.16.1, Cloudreve's remote download workflow accepts user-supplied URLs at POST /api/v4/workflow/download and passes them to the configured downloader without blocking loopback, localhost, IPv6 localhost, or redirect-to-loopback targets, allowing a non-admin user with remote download permission to fetch internal-only URLs and read the response after it is imported into the user's own files. This issue is fixed in version 4.16.1.

Record
CVE-2026-54562
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-918
Updated
2026-11-02
OSV 6.5

Cloudreve: Non-admin remote download users can SSRF loopback/internal services and read imported responses

Cloudreve is a self-hosted file management and sharing system. Prior to 4.16.1, Cloudreve's remote download workflow accepts user-supplied URLs at POST /api/v4/workflow/download and passes them to the configured downloader without blocking loopback, localhost, IPv6 localhost, or redirect-to-loopback targets, allowing a non-admin user with remote download permission to fetch internal-only URLs and read the response after it is imported into the user's own files. This issue is fixed in version 4.16.1.

Record
CVE-2026-54562
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-918
Updated
2026-11-02
OSVGHSA-x756-g4x3-c64m 6.5

Cloudreve: Non-admin remote download users can SSRF loopback/internal services and read imported responses

Summary

Cloudreve's remote download workflow accepts user-supplied URLs and passes them to the configured downloader without blocking loopback, localhost, IPv6 localhost, or redirect-to-loopback targets.

When the remote download permission is granted to a non-admin user group, a normal authenticated user can make the server-side downloader fetch internal-only URLs and then read the fetched response after it is imported into the user's own Cloudreve files.

This does not affect default normal users unless the remote download permission is enabled for their group. However, the permission is a feature-level user-group capability and does not make the user an administrator.

Attacker requirements

The attacker must be:

  • authenticated
  • non-admin
  • in a user group where GroupPermissionRemoteDownload is enabled

Default normal users are blocked from the affected workflow. In the default install, only the admin group has the remote download permission, while the default User group does not.

Affected endpoint

POST /api/v4/workflow/download

Follow-up attacker readback was performed through normal workflow and file APIs:

GET /api/v4/workflow?category=downloaded...
GET /api/v4/file?uri=cloudreve://my...
POST /api/v4/file/url

Root cause

The remote download workflow checks whether the user group has remote download permission, but it does not validate the submitted URL before passing it to the downloader.

Relevant code paths:

  • service/explorer/workflows.go:81
  • pkg/filemanager/workflows/remote_download.go:202
  • pkg/downloader/aria2/aria2.go:56

The application does not block loopback, localhost, IPv6 localhost, or redirect targets resolving to internal addresses.

Impact

A non-admin user with remote download permission can use Cloudreve as an SSRF primitive to access services reachable from the downloader environment.

In my test, the attacker could fetch internal loopback URLs and read the response body after Cloudreve imported the downloaded content into the attacker's own files.

Confirmed targets:

  • http://127.0.0.1:7777/secret2
  • http://localhost:7777/localsecret
  • http://[::1]:7780/v6secret
  • redirect to http://127.0.0.1:7777/redirsecret

This can expose internal HTTP services, loopback-only admin panels, local service metadata, or other network resources that are not directly reachable by the attacker.

Reproduction

1. Permission negative control

The attacker is a normal non-admin user in the default User group.

Before enabling remote download for the group:

POST /api/v4/workflow/download
Content-Type: application/json

{"src":["http://127.0.0.1:7777/secret"],"dst":"cloudreve://my"}

Response:

{"code":40007,"msg":"Group not allowed to download files"}

2. Enable only remote download permission for the non-admin group

The default install grants remote download to the admin group only. The default User group does not have it.

Confirmed in:

  • inventory/migration.go:154
  • inventory/migration.go:179

For this test, I only changed group 2 permissions from:

hAg=

to:

hAo=

The attacker remained in the User group and was not made admin. GET /api/v4/user/me still returned the group name as User.

3. Start an internal listener

Example listener on the Cloudreve host:

127.0.0.1:7777

The listener returned a marker response:

SSRF_SECRET_2_20260527

4. Queue a remote download to loopback

POST /api/v4/workflow/download
Content-Type: application/json

{"src":["http://127.0.0.1:7777/secret2"],"dst":"cloudreve://my"}

Response:

{"code":0,"data":[{"id":"OzH4","status":"queued","type":"remote_download"}]}

The internal listener received the request:

127.0.0.1 - - [27/May/2026 13:00:46] "GET /secret2 HTTP/1.1" 200 -

Aria2 completed the download:

Download complete:…
Record
GHSA-x756-g4x3-c64m
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-918
Updated
2026-11-02
OSVGO-2026-6023 No score

Cloudreve: Non-admin remote download users can SSRF loopback/internal services and read imported responses in github.com/cloudreve/Cloudreve

Cloudreve: Non-admin remote download users can SSRF loopback/internal services and read imported responses in github.com/cloudreve/Cloudreve

Record
GO-2026-6023
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/cloudreve/Cloudreve/v4
Go
 before 4.0.0-20260606025411-aaebf317a78f
4.0.0-20260606025411-aaebf317a78f
github.com/cloudreve/Cloudreve/v3
Go
 through 3.0.0-20250225100611-da4e44b77af4 None known
github.com/cloudreve/Cloudreve
Go
 All versions None known
github.com/cloudreve/Cloudreve/v3
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-2026-54562 is a medium vulnerability (CVSS 6.5) in Cloudreve, published July 15, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 34th percentile. Fixed in github.com/cloudreve/Cloudreve/v4 4.0.0-20260606025411-aaebf317a78f.

References

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