Mastodon up to 4.4.18/4.5.0-4.5.11 Ldap Authentication ldap_authenticable.rb LDAP_TLS_NO_VERIFY certificate validation

Summaryinfo

A vulnerability was found in Mastodon up to 4.4.18/4.5.0-4.5.11. It has been rated as problematic. This impacts an unknown function of the file app/models/concerns/user/ldap_authenticable.rb of the component Ldap Authentication. This manipulation of the argument LDAP_TLS_NO_VERIFY causes certificate validation. This vulnerability is handled as CVE-2026-59825. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Mastodon up to 4.4.18/4.5.0-4.5.11. It has been declared as problematic. Affected by this vulnerability is an unknown function of the file app/models/concerns/user/ldap_authenticable.rb of the component Ldap Authentication. The manipulation of the argument LDAP_TLS_NO_VERIFY with an unknown input leads to a certificate validation vulnerability. The CWE definition for the vulnerability is CWE-295. The product does not validate, or incorrectly validates, a certificate. As an impact it is known to affect integrity. The summary by CVE is:

Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.4.19 and from 4.5.0 until 4.5.12, Mastodon's app/models/concerns/user/ldap_authenticable.rb mutates OpenSSL::SSL::SSLContext::DEFAULT_PARAMS when LDAP authentication uses LDAP_TLS_NO_VERIFY=true, disabling SSL and TLS certificate verification globally for requests made by puma web processes while sidekiq background jobs remain unaffected. This issue is fixed in versions 4.4.19 and 4.5.12.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-59825 since 07/07/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1587.003 for this issue.

Upgrading to version 4.4.19 or 4.5.12 eliminates this vulnerability.

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Productinfo

Name

• Mastodon

Version

• 4.4.0
• 4.4.1
• 4.4.2
• 4.4.3
• 4.4.4
• 4.4.5
• 4.4.6
• 4.4.7
• 4.4.8
• 4.4.9
• 4.4.10
• 4.4.11
• 4.4.12
• 4.4.13
• 4.4.14
• 4.4.15
• 4.4.16
• 4.4.17
• 4.4.18
• 4.5.0-4.5.0
• 4.5.0-4.5.1
• 4.5.0-4.5.2
• 4.5.0-4.5.3
• 4.5.0-4.5.4
• 4.5.0-4.5.5
• 4.5.0-4.5.6
• 4.5.0-4.5.7
• 4.5.0-4.5.8
• 4.5.0-4.5.9
• 4.5.0-4.5.10
• 4.5.0-4.5.11

Website

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

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