Answer in brief
CVE-2026-86112 records a Medium severity (CVSS 5.3) vulnerability in BookWyrm through 0.9.1 Missing Authorization on the Favorite and Unfavorite Endpoints. The current sources do not mark it as known exploited. The current feed maps bookwyrm-social/bookwyrm (generic), bookwyrm-social/bookwyrm (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps bookwyrm-social/bookwyrm (generic), bookwyrm-social/bookwyrm (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| bookwyrm-social/bookwyrmgeneric | 0 | Not reported |
| bookwyrm-social/bookwyrmgeneric | >=0 <=0.9.1 | Not reported |
Published upstream
Sep 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.