CVE-2026-86112
Medium
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.
SeverityMedium
CVSS5.4
Exploit probability—
ProductBookwyrm
PublishedSep 5, 2026
First seenSep 5, 2026
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| bookwyrm-social bookwyrm | v ≤ 0.9.1 | — |
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