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Fencer Intel
high 7.6

CVE-2026-54560 json

Cloudreve: OAuth access tokens bypass scope enforcement due to missing client_id claim

published 3mo ago modified 3mo ago also EUVD-2026-44689 , GHSA-vgj4-345g-jcf8 , GO-2026-6022

cvss
7.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

Cloudreve is a self-hosted file management and sharing system. From 4.12.0 until 4.16.1, Cloudreve's OAuth access tokens are issued without the OAuth client_id claim, so the JWT verifier does not load token scopes into request context and RequiredScopes treats the request like non-scoped session authentication, allowing a low-scope OAuth access token to call APIs requiring higher scopes such as file, share, workflow, user setting, WebDAV account, and potentially admin scopes. This issue is fixed in version 4.16.1.

Patch / fix

  • go github.com/cloudreve/Cloudreve/v4 4.0.0-20260606015557-ed20843dc3df
  • cloudreve cloudreve 4.16.1
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

Is CVE-2026-54560 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
3mo ago

Exploit prediction

0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/cloudreve/cloudreve/security/advisories/GHSA-vgj4-345g-jcf8 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L
GitHub 3.1 7.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

Affected packages

ecosystem package affected fixed in
go github.com/cloudreve/Cloudreve/v4
>=4.0.0-20260114075425-bc6845bd742c, <4.0.0-20260606015557-ed20843dc3df
4.0.0-20260606015557-ed20843dc3df
go github.com/cloudreve/Cloudreve
all versions
 no fix listed
go github.com/cloudreve/Cloudreve/v3
all versions
 no fix listed

Affected products

  • cloudreve cloudreve

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.