CVE-2026-86112

MediumCVSS 5.4/10Last modified Sep 10, 2026

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.

Metrics

CVSS 3.1 5.4/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-639

Affected software

Vendor	Product	Versions
bookwyrm-social	bookwyrm	<= 0.9.1

References

Timeline

Published: Sep 5, 2026
Last modified: Sep 10, 2026
NVD status: Deferred

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