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    CVE-2026-82980

    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.

    Published:Sep 18, 2026
    Last Modified:Sep 19, 2026
    EPS:Sep 18, 2026
    EPSS Score:0.00208
    CVSS Score:6.3

    Affected Products

    Vendor
    Nextcloud
    Product
    Files Lock

    Exploits

    No exploit reference

    Common Weakness Enumeration

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High