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.
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Fixes

Solution

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Workaround

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History

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: 2026-09-05T09:59:04.004Z

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

Link: CVE-2026-86112

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-86112

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-05T11:30:05Z

Weaknesses