CVE-2026-86112: Authorization Bypass Through User-Controlled Key in bookwyrm-social bookwyrm
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.
CVE-2026-86112: Authorization Bypass Through User-Controlled Key in bookwyrm-social bookwyrm
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 v4.0
Score 5.3medium
Affected software
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Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-05T01:59:19.567Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a9bed73acd9273b49b1c666
Added to database: 09/05/2026, 10:22:43 UTC
Last updated: 09/06/2026, 02:23:17 UTC
Views: 13
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