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    CVE-2026-86112

    BookWyrm through 0.9.1 fails to validate user visibility permissions in the Favorite and Unfavorite views, allowing authenticated attackers to favorite or unfavorite followers-only and direct statuses they cannot access. Attackers can POST to the favorite endpoint with a status ID to create unauthorized interactions, trigger ActivityPub broadcasts, and enumerate private status IDs through response differentiation.

    Published:Sep 5, 2026
    Last Modified:Sep 7, 2026
    EPS:Sep 5, 2026
    EPSS Score:0.00177
    CVSS Score:5.4

    Affected Products

    Vendor
    Bookwyrm-social
    Product
    Bookwyrm
    Vendor
    Joinbookwyrm
    Product
    Bookwyrm

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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