CVE-2026-86111

Summary

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.

Affected Software

Weaknesses

• CWE-639: Authorization Bypass Through User-Controlled Key

References

• https://github.com/geo-chen/oss/blob/main/bookwyrm.md#finding-1-authenticated-idor-in-editstatus-exposes-private-review-comment-and-quotation-content
• https://github.com/bookwyrm-social/bookwyrm/blob/v0.9.1/bookwyrm/views/status.py
• https://github.com/bookwyrm-social/bookwyrm/blob/v0.9.1/bookwyrm/templates/snippets/create_status/content_field.html
• https://github.com/bookwyrm-social/bookwyrm
• https://www.vulncheck.com/advisories/bookwyrm-through-0.9.1-insecure-direct-object-reference-in-editstatus-exposes-followers-only-and-direct-statuses

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