CVE-2023-27582

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 31% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
59.7%
KEV
Not listed

Published

March 13, 2023

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Jul 22, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

Full authentication bypass if SASL authorization username is specified · Advisory · foxcpp/maddy · GitHub

https://github.com/foxcpp/maddy/security/advisories/GHSA-4g76-w3xw-2x6w
github_release Patch Available

maddy 0.6.3

Patch available: foxcpp/maddy v0.6.3

https://github.com/foxcpp/maddy/releases/tag/v0.6.3
github_commit

commit 9f58cb64b39c (foxcpp/maddy)

Fix landed in foxcpp/maddy commit 9f58cb64b39c — awaiting tagged release

https://github.com/foxcpp/maddy/commit/9f58cb64b39cdc01928ec463bdb198c4c2313a9c
github_commit

commit 55a91a37b712 (foxcpp/maddy)

Fix landed in foxcpp/maddy commit 55a91a37b712 — awaiting tagged release

https://github.com/foxcpp/maddy/commit/55a91a37b71210f34f98f4d327c30308fe24399a

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/foxcpp/maddy—0.6.3—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 104 total refreshes for this CVE.

  1. 2026-07-22 14:06 UTCEPSS rescore
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  1. 2026-07-09 19:08 UTCEPSS rescore
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2023-27582?
CVE-2023-27582 is a critical vulnerability published on March 13, 2023. 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…
When was CVE-2023-27582 disclosed?
CVE-2023-27582 was first published in the National Vulnerability Database on March 13, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-27582 actively exploited?
CVE-2023-27582 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 59.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-27582?
CVE-2023-27582 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2023-27582?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-27582, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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