CVE-2026-62323CWE-863broken-access-control

CVE-2026-62323

Medium · published July 31, 2026

CVSS v3.1
6.3
EPSS
0%
Percentile
22.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00306 · 22.2th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-07-31T08:17Z
References (4)
https://github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dda9cba9 · [email protected]https://github.com/cloudreve/cloudreve/releases/tag/4.17.0 · [email protected]https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp · [email protected]https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 31 JUL 03:43Z
    Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored
    cvelistv5