TI-2023-12292 Aliases CVE-2023-27582 GHSA-4g76-w3xw-2x6w

Full authentication bypass if SASL authorization username is specified

MEDIUM 51CWE-287Published 2023-03-13 · Updated 2025-02-25

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-287.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01019 63rd percentileScored 2026-11-07

Fix Fixed github.com/foxcpp/maddy (Go): 0.6.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
foxcpp	maddy	>= 0.2.0 0.6.3	—	No fix listed	CNA
—	github.com/foxcpp/maddy (Go)	0.2.0 to before 0.6.3	0.6.3	Patch available	GHSA-4g76-w3xw-2x6w

maddy Vendorfoxcpp Affected >= 0.2.0 0.6.3 Fixed in — No fix listed CNA
github.com/foxcpp/maddy (Go) Vendor— Affected 0.2.0 to before 0.6.3 Fixed in 0.6.3 Patch available GHSA-4g76-w3xw-2x6w

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:maddy_project:maddy::::::::	0.2.0 to before 0.6.3	Vulnerable	Maddy Project

cpe:2.3:a:maddy_project:maddy:*:*:*:*:*:*:*:* Versions 0.2.0 to before 0.6.3 Vulnerable ·Maddy Project

Remediation

Fix · GHSA-4g76-w3xw-2x6w github.com/foxcpp/maddy (Go) Fixed in 0.6.3 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2023-27582
2026-10-03 Alias added: GHSA-4g76-w3xw-2x6w

References

Patch 3

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2023-27582

Other 2

TI-2026-29007 Maddy Mail Server: LDAP Filter Injection via Unsanitized Username CVSS 3.1HIGH 8.2
TI-2022-08546 Maddy Mail Server does not implement account expiry CVSS 3.1HIGH 8.8
TI-2021-18860 A Broken or Risky Cryptographic Algorithm exists in Max Mazurov Maddy before 0.5.2, which… CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences