CVE-2026-82980

State
Published
Severity
6.3 Medium
Published
Sep 18, 2026
Updated
Sep 18, 2026
Reserved
Aug 31, 2026

Read the record on cve.org

Description

Any authenticated user can lock or unlock files they do not own by targeting absolute WebDAV paths of other users. The DAV plugin resolves files from the absolute request URI without verifying that the path segment matches the authenticated session user. This enables:

Cross-user manual locks : attacker locks a victim's files, blocking writes (PUT/MOVE/DELETE, editor saves). Lock-token disclosure: the app returns the lock token to unauthorized callers, enabling them to remove token-based locks (client locks) of other users.

Scores

CVSSScoreVectorSource
3.06.3 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:Lhackerone

Weaknesses

  • CWE-287 Improper Authentication - Generic

Affected Products

ProductVersions
Files LockNextcloud
  • 31.0.0 through 33.0.0Affected

References

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