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.

Project Subscriptions

Vendors Products
Bookwyrm-social Subscribe
Bookwyrm Subscribe
Joinbookwyrm Subscribe
Bookwyrm Subscribe
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 10 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 07 Sep 2026 08:45:00 +0000

Type Values Removed Values Added
First Time appeared Bookwyrm-social
Bookwyrm-social bookwyrm
Vendors & Products Bookwyrm-social
Bookwyrm-social bookwyrm

Sat, 05 Sep 2026 10:15:00 +0000

Type Values Removed Values Added
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.
Title BookWyrm through 0.9.1 Missing Authorization on the Favorite and Unfavorite Endpoints
First Time appeared Joinbookwyrm
Joinbookwyrm bookwyrm
Weaknesses CWE-639
CPEs cpe:2.3:a:joinbookwyrm:bookwyrm:*:*:*:*:*:*:*:*
Vendors & Products Joinbookwyrm
Joinbookwyrm bookwyrm
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-10T15:05:57.845Z

Reserved: 2026-09-05T01:59:19.567Z

Link: CVE-2026-86112

cve-icon Vulnrichment

Updated: 2026-09-10T14:19:14.939Z

cve-icon NVD

Status : Deferred

Published: 2026-09-05T10:16:42.130

Modified: 2026-09-10T16:18:01.420

Link: CVE-2026-86112

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-07T08:25:23Z

Weaknesses