CVE-2023-28853

Mastodon is a free, open-source social network server based on ActivityPub Mastodon allows configuration of LDAP for authentication. Starting in version 2.5.0 and prior to versions 3.5.8, 4.0.4, and 4.1.2, the LDAP query made during login is insecure and the attacker can perform LDAP injection attack to leak arbitrary attributes from LDAP database. This issue is fixed in versions 3.5.8, 4.0.4, and 4.1.2.

• CWE-90
• CWE-74

• http://www.openwall.com/lists/oss-security/2023/07/06/6
• https://github.com/mastodon/mastodon/blob/94cbd808b5b3e7999c7e77dc724b7e8c9dd2bdec/app/models/concerns/ldap_authenticable.rb#L7-L14Product
• https://github.com/mastodon/mastodon/blob/94cbd808b5b3e7999c7e77dc724b7e8c9dd2bdec/config/initializers/devise.rb#L398-L414Product
• https://github.com/mastodon/mastodon/pull/24379Patch
• https://github.com/mastodon/mastodon/releases/tag/v3.5.8Release Notes
• https://github.com/mastodon/mastodon/releases/tag/v4.0.4Release Notes
• https://github.com/mastodon/mastodon/releases/tag/v4.1.2Release Notes
• https://github.com/mastodon/mastodon/security/advisories/GHSA-38g9-pfm9-gfqvExploit, Vendor Advisory
• http://www.openwall.com/lists/oss-security/2023/07/06/6
• https://github.com/mastodon/mastodon/blob/94cbd808b5b3e7999c7e77dc724b7e8c9dd2bdec/app/models/concerns/ldap_authenticable.rb#L7-L14Product
• https://github.com/mastodon/mastodon/blob/94cbd808b5b3e7999c7e77dc724b7e8c9dd2bdec/config/initializers/devise.rb#L398-L414Product
• https://github.com/mastodon/mastodon/pull/24379Patch
• https://github.com/mastodon/mastodon/releases/tag/v3.5.8Release Notes
• https://github.com/mastodon/mastodon/releases/tag/v4.0.4Release Notes
• https://github.com/mastodon/mastodon/releases/tag/v4.1.2Release Notes
• https://github.com/mastodon/mastodon/security/advisories/GHSA-38g9-pfm9-gfqvExploit, Vendor Advisory

Published

Apr 4, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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