Authelia up to 4.38.18 excessive authentication

Summaryinfo

A vulnerability categorized as problematic has been discovered in Authelia up to 4.38.18. This affects an unknown function. The manipulation results in excessive authentication. This vulnerability is cataloged as CVE-2025-24806. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Authelia up to 4.38.18. It has been classified as problematic. Affected is an unknown functionality. The manipulation with an unknown input leads to a excessive authentication vulnerability. CWE is classifying the issue as CWE-307. The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame, making it more susceptible to brute force attacks. This is going to have an impact on confidentiality. CVE summarizes:

Authelia is an open-source authentication and authorization server providing two-factor authentication and single sign-on (SSO) for applications via a web portal. If users are allowed to sign in via both username and email the regulation system treats these as separate login events. This leads to the regulation limitations being effectively doubled assuming an attacker using brute-force to find a user password. It's important to note that due to the effective operation of regulation where no user-facing sign of their regulation ban being visible either via timing or via API responses, it's effectively impossible to determine if a failure occurs due to a bad username password combination, or a effective ban blocking the attempt which heavily mitigates any form of brute-force. This occurs because the records and counting process for this system uses the method utilized for sign in rather than the effective username attribute. This has a minimal impact on account security, this impact is increased naturally in scenarios when there is no two-factor authentication required and weak passwords are used. This makes it a bit easier to brute-force a password. A patch for this issue has been applied to versions 4.38.19, and 4.39.0. Users are advised to upgrade. Users unable to upgrade should 1. Not heavily modify the default settings in a way that ends up with shorter or less frequent regulation bans. The default settings effectively mitigate any potential for this issue to be exploited. and 2. Disable the ability for users to login via an email address.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2025-24806 since 01/23/2025. The exploitability is told to be difficult. It is possible to launch the attack remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1110.001.

Upgrading to version 4.38.19 eliminates this vulnerability. Applying the patch d4a54189aa6563912f9427b96dcb01eacafa785c is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• Authelia

Version

• 4.38.0
• 4.38.1
• 4.38.2
• 4.38.3
• 4.38.4
• 4.38.5
• 4.38.6
• 4.38.7
• 4.38.8
• 4.38.9
• 4.38.10
• 4.38.11
• 4.38.12
• 4.38.13
• 4.38.14
• 4.38.15
• 4.38.16
• 4.38.17
• 4.38.18

License

• open-source

Website

• Product: https://github.com/authelia/authelia/

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