CVE-2026-82980

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-82980
StatePUBLISHED
Assignerhackerone
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 02:17:07 UTC
Updated2026-09-18 20:17:25 UTC
DescriptionAny 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.

Risk And Classification

Primary CVSS: v3.0 6.3 MEDIUM from [email protected]

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

EPSS: 0.002080000 probability, percentile 0.112580000 (date 2026-09-21)

Problem Types: CWE-287 | CWE-287 CWE-287 Improper Authentication - Generic

VersionSourceTypeScoreSeverityVector
3.0[email protected]Secondary6.3MEDIUMCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
3.0CNADECLARED6.3MEDIUMCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nextcloud Files Lock affected 31.0.0 33.0.0 semver Not specified

References

ReferenceSourceLinkTags
hackerone.com/reports/3301553 [email protected] hackerone.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Balvant Chavda (0x0doteth) (en)

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