CVE-2025-66547CWE-639

CVE-2025-66547

Medium · published December 5, 2025

CVSS v3.1
4.3
EPSS
0%
Percentile
19.3
In the wild
Unconfirmed
What it is

Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Enterprise Server prior to 31.0.1, non-privileged users can modify tags on files they should not have access to via bulk tagging. This vulnerability is fixed in 31.0.1.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00279 · 19.3th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2025-12-05T22:16Z
Affected products (2)
ProductVersionsFixed in
nextcloud/nextcloud_server≥ 31.0.0, < 31.0.131.0.1
nextcloud/nextcloud_server≥ 31.0.0, < 31.0.131.0.1
References (5)
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2 · [email protected]https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9 · [email protected]https://github.com/nextcloud/server/issues/51247 · [email protected]https://github.com/nextcloud/server/pull/51288 · [email protected]https://hackerone.com/reports/3040887 · [email protected]
EPSS history
Timeline
  • 05 DEC 16:32Z
    Nextcloud Server users can modify tags on files that do not belong to them
    cvelistv5