CVE-2026-62323

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.

CVSS v3.1

6.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N

CVSS v3.1

6.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N

EPSS

0.17% chance of exploitation in the next 30 days, 7th percentile

Published

2026-07-31

Proof-of-concept exploits (1)

• advisories/GHSA-c3jm-gv5r-9wcp

References

• CVE Record
• NVD entry

Related

• CVE-2026-6227
• CVE-2026-62324
• CVE-2026-62242
• CVE-2026-62325
• CVE-2026-62240
• CVE-2026-62382