Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/bookwyrm-social/bookwyrm
- https://github.com/bookwyrm-social/bookwyrm/blob/v0.9.1/bookwyrm/views/interacti
- https://github.com/geo-chen/oss/blob/main/bookwyrm.md#finding-2-authenticated-id
- https://www.vulncheck.com/advisories/bookwyrm-through-0.9.1-missing-authorizatio
FAQ
What is CVE-2026-86112?
CVE-2026-86112 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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...
How severe is CVE-2026-86112?
CVE-2026-86112 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-86112?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.