CVE-2023-27582

maddy is a composable, all-in-one mail server. Starting with version 0.2.0 and prior to version 0.6.3, maddy allows a full authentication bypass if SASL authorization username is specified when using the PLAIN authentication mechanisms. Instead of validating the specified username, it is accepted as is after checking the credentials for the authentication username. maddy 0.6.3 includes the fix for the bug. There are no known workarounds.

• CWE-287
• CWE-305
• CWE-287

• https://github.com/foxcpp/maddy/commit/55a91a37b71210f34f98f4d327c30308fe24399aPatch
• https://github.com/foxcpp/maddy/commit/9f58cb64b39cdc01928ec463bdb198c4c2313a9cPatch
• https://github.com/foxcpp/maddy/releases/tag/v0.6.3Release Notes
• https://github.com/foxcpp/maddy/security/advisories/GHSA-4g76-w3xw-2x6wPatch, Vendor Advisory
• https://github.com/foxcpp/maddy/commit/55a91a37b71210f34f98f4d327c30308fe24399aPatch
• https://github.com/foxcpp/maddy/commit/9f58cb64b39cdc01928ec463bdb198c4c2313a9cPatch
• https://github.com/foxcpp/maddy/releases/tag/v0.6.3Release Notes
• https://github.com/foxcpp/maddy/security/advisories/GHSA-4g76-w3xw-2x6wPatch, Vendor Advisory

Published

Mar 13, 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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