CVE-2026-71209
audiobookshelf - %2F Encoding Discrepancy Bypasses Cover/Image Auth Exemption Regex, Enabling Unauthenticated Path Traversal
- State
- Published
- Severity
- 7.5 High
- Published
- Aug 5, 2026
- Updated
- Aug 10, 2026
- Reserved
- Aug 5, 2026
Description
audiobookshelf's authentication-exemption check (server/routers/Auth.js) matches unauthenticated-allowed GET routes against req.path via a regex requiring a literal /items/:id/cover or /authors/:id/image shape, where req.path retains %2F sequences URL-encoded. CacheManager.handleCoverCache then joins this decoded value into a cache file path and streams the result before any database-backed ownership check.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | TuranSec |
Weaknesses
- CWE-22 Path Traversal
Affected Products
| Product | Versions |
|---|---|
audiobookshelfadvplyr |
|
References
- https://github.com/advplyr/audiobookshelf/security/advisories/GHSA-pg8v-5jcv-wrvwthird-party-advisory
- https://github.com/advplyr/audiobookshelfthird-party-advisory
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