VULNERABILITY INTELLIGENCE
CVE-2026-86112
CVSS score5.4 MEDIUM
EPSS probability0.30%
CISA KEVNot currently listed
Published2026-09-05
Last modified2026-09-10
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Description
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.
Weakness classification
- disclosure@vulncheck.com: CWE-639