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Fencer Intel
medium 6.3

CVE-2026-62323 json

Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored

published 3mo ago modified 2mo ago also EUVD-2026-51395 , GHSA-c3jm-gv5r-9wcp , GO-2026-6104

cvss
6.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits
0
none known

Summary

Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, ViewerSessionValidation uses only the session-id prefix of a WOPI access token and does not enforce the requested viewer action, allowing a malicious or compromised WOPI viewer with a view session to forge the token suffix and invoke WOPI write routes for the underlying file. This issue is fixed in version 4.17.0.

Patch / fix

  • go github.com/cloudreve/Cloudreve/v4 4.0.0-20260626022433-f3347130ac48
  • cloudreve cloudreve 4.17.0
  • govulncheck-vulndb SLES for SAP applications 16.0, SLES 16.0 0.0.20260827T195228-160000.1.1

suse advisories SUSE-SU-2026:23625-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260827T195228-160000.1.1

opensuse advisories openSUSE-SU-2026:21761-1

Is CVE-2026-62323 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
partial
Assessed
3mo ago

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N
GitHub 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N

Affected packages

ecosystem package affected fixed in
go github.com/cloudreve/Cloudreve/v4
<4.0.0-20260626022433-f3347130ac48
4.0.0-20260626022433-f3347130ac48
go github.com/cloudreve/Cloudreve/v3
<=3.0.0-20250225100611-da4e44b77af4
all versions
 no fix listed
go github.com/cloudreve/Cloudreve
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.