BookWyrm through 0.9.1 Missing Authorization on the Favorite and Unfavorite Endpoints
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| bookwyrm-social | bookwyrm | up to 0.9.1 | — | No fix listed | CNA |
- bookwyrm Vendorbookwyrm-social Affected up to 0.9.1 Fixed in — No fix listed CNA
CPE names Threatist (inferred) · 1
Inferred from how NVD named this product before; not given by a source.
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:joinbookwyrm:bookwyrm:*:*:*:*:*:*:*:* | — | — | bookwyrm-social |
- cpe:2.3:a:joinbookwyrm:bookwyrm:*:*:*:*:*:*:*:* Versions — — ·bookwyrm-social
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-86112
- 2026-10-03 Alias added: GHSA-6779-9x55-mqpq
References
More bookwyrm-social vulnerabilities
- TI-2022-16352 Missing rate limit in Authentication in bookwyrm CVSS 3.1CRITICAL 9.8
- TI-2026-58912 Authorization bypass in bookwyrm-social bookwyrm CVSS 4.0HIGH 7.1
- TI-2026-58910 BookWyrm through 0.9.1 Insecure Direct Object Reference in EditStatus Exposes Followers-Only and Direct Statuses CVSS 4.0HIGH 7.1
- TI-2022-16380 URL Redirection to Untrusted Site ('Open Redirect') in bookwyrm CVSS 3.1HIGH 7.1
- TI-2022-02451 Authentication Bypass by Primary Weakness in bookwyrm-social/bookwyrm CVSS 3.1CRITICAL 9.8
- TI-2022-07696 Server-side request forgery in BookWyrm CVSS 3.1HIGH 8.8
Sources
- CVE-2026-86112 · CVE Program
- CVE-2026-86112 · NVD
- FIRST EPSS
- GHSA-6779-9x55-mqpq · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences