27 June 2026
Reference: CVE-2025-25205
1. What is being reported?
The problem is with how Audiobookshelf checks if users are logged in. Between versions 2.17.0 and before 2.19.1, attackers can use specially crafted web addresses to trick the system into thinking they are logged in when they are not. This can let them see data they shouldn’t or cause the server to stop working.
2. What this means in plain English
If you use Audiobookshelf to manage audio content, someone could exploit this flaw to see private information or disrupt your service by crashing the server. This could affect your ability to serve your users or members and potentially expose sensitive data.
3. Could this affect a small business?
Small organisations running Audiobookshelf on their own servers could be affected if they use versions before 2.19.1. If you do not use this software, or if your provider manages updates for you, the risk is lower. Ask your IT support if you are unsure.
4. What to do now
- Check if you use Audiobookshelf and identify the version installed.
- If your version is older than 2.19.1, arrange to update it to the latest version immediately.
- If you do not manage the software yourself, contact your IT provider or software supplier to confirm they have applied the fix.
- Monitor your server for unusual activity and ensure regular backups are in place in case of disruption.
5. Ask your IT provider
Can you confirm if our Audiobookshelf installation is updated to version 2.19.1 or later to protect against the recent authentication bypass vulnerability?
6. Bottom line
Updating Audiobookshelf promptly will protect your organisation from data exposure and service disruption caused by this security flaw.
Information based on NVD, CISA KEV, and reputable security reporting.