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CVE-2026-86112

BookWyrm through 0.9.1 Missing Authorization on the Favorite and Unfavorite Endpoints

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 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
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Bookwyrm-social Joinbookwyrm
Products
Bookwyrm Bookwyrm
CVE-2026-86111

BookWyrm through 0.9.1 Insecure Direct Object Reference in EditStatus Exposes Followers-Only and Direct Statuses

BookWyrm through 0.9.1 fails to validate user visibility permissions in the status edit endpoint, allowing authenticated attackers to read followers-only and direct-message reviews by enumerating sequential status IDs. Attackers can access the raw content of restricted statuses through the edit view, bypassing the privacy protections documented for these message types.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Bookwyrm-social Joinbookwyrm
Products
Bookwyrm Bookwyrm
CVE-2026-86113

BookWyrm through 0.9.1 Insecure Direct Object Reference in edit-readthrough Allows Tampering with Other Users' Reading Records

BookWyrm through 0.9.1 contains an authorization bypass vulnerability in the edit_readthrough function that allows authenticated users to modify other users' reading records. Attackers can exploit sequential ReadThrough IDs to overwrite arbitrary users' start dates, finish dates, progress, and progress mode, affecting reading statistics and exported data.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Bookwyrm-social Joinbookwyrm
Products
Bookwyrm Bookwyrm