What’s Vulnerable › Vulnerabilities

CVE-2025-25205: Remote Authentication-Bypass can lead to server crash or limited information disclosure due to faulty pattern matching

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-02-12 · updated 2026-06-17
• Weakness: CWE-202

Description

Audiobookshelf is a self-hosted audiobook and podcast server. Starting in version 2.17.0 and prior to version 2.19.1, a flaw in the authentication bypass logic allows unauthenticated requests to match certain unanchored regex patterns in the URL. Attackers can craft URLs containing substrings like "/api/items/1/cover" in a query parameter (?r=/api/items/1/cover) to partially bypass authentication or trigger server crashes under certain routes. This could lead to information disclosure of otherwise protected data and, in some cases, a complete denial of service (server crash) if downstream code expects an authenticated user object. Version 2.19.1 contains a patch for the issue.

Affected products

• advplyr audiobookshelf: from 2.17.0 before 2.19.1 — fixed in 2.19.1

How to fix

Upgrade to a fixed version: advplyr audiobookshelf 2.19.1. Check the vendor advisory for mitigations.

References

• https://github.com/advplyr/audiobookshelf/blob/1a3d70d04100924d41391acb55bd8ddca486a4fa/server/Auth.js#L17-L41
• https://github.com/advplyr/audiobookshelf/commit/bf8407274e3ee300af1927ee660d078a7a801e1c
• https://github.com/advplyr/audiobookshelf/commit/ec6537656925a43871b07cfee12c9f383844d224
• https://github.com/advplyr/audiobookshelf/pull/3584
• https://github.com/advplyr/audiobookshelf/security/advisories/GHSA-pg8v-5jcv-wrvw

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