CVE-2025-66547

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
4.3 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
GitHub_MCNA
4.3 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CISA-ADPADP
---
---
Base Score
CVSS 3.x
EPSS Score
Percentile: 3%
VendorProductVersion
nextcloudnextcloud_server
31.0.0 ≤
𝑥
< 31.0.1
nextcloudnextcloud_server
31.0.0 ≤
𝑥
< 31.0.1
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-hq6c-r898-fgf2
https://github.com/nextcloud/server/commit/b44f1568f2dc97c746281d99e2342ad679e3d8a9
https://github.com/nextcloud/server/issues/51247
https://github.com/nextcloud/server/pull/51288
https://hackerone.com/reports/3040887