What is CVE-2026-49217?

CVE-2026-49217 is a high-severity vulnerability in Mailu, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-08-20.

How severe is CVE-2026-49217?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Mailu

CVE-2026-49217

Mailu is a mail server as a set of Docker images. Prior to version 2024.06.52, a missing authorization check in the Mailu admin REST API allows any unauthenticated attacker to remove any potential IP restriction or update the comment field from any existing user token provided the REST API is enabled. Upgrade to Mailu 2024.06.52 to receive a patch or, as a workaround, turn the REST API off.

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Mailu — versions < 2024.06.52

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-49217?: CVE-2026-49217 is a high-severity vulnerability in Mailu, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-08-20.
How severe is CVE-2026-49217?: High severity. CVSS v3 base score is 7.5 out of 10.