CVE-2026-62323 json
Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored
published 2026-07-24 3 mo ago modified 2026-09-08 2 mo ago also GHSA-c3jm-gv5r-9wcp , GO-2026-6104 , EUVD-2026-51395
- 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
- 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
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.31% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).
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
-
- CWE-863 Incorrect Authorization
References
Sources
- CVE List CVE-2026-62323
- GitHub Advisory GHSA-c3jm-gv5r-9wcp
- NVD CVE-2026-62323
- OSV GO-2026-6104
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