PT-2026-28336 · Dovecot+2 · Dovecot+2

Published 2026-01-01 · Updated 2026-04-16 · CVE-2026-24031

Positive Technologies (AI Summary)

CVSS v3.1

8.2

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Name of the Vulnerable Software and Affected Versions Dovecot (affected versions not specified)

Description Dovecot’s SQL-based authentication mechanism can be bypassed when the auth username chars setting is cleared by an administrator. This allows an attacker to bypass authentication for any user and perform user enumeration. No publicly available exploits are known at this time. The vulnerable component is the SQL authentication module. The vulnerable parameter is auth username chars.

Recommendations Do not clear the auth username chars setting. If clearing the setting is unavoidable, install the latest fixed version. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

SQL injection

Weakness Enumeration

CWE-89

Related Identifiers

CVE-2026-24031

OPENSUSE-SU-2026:10442-1

OPENSUSE-SU-2026:20554-1

SUSE-SU-2026:21208-1

USN-8136-1

Affected Products

Dovecot

Linuxmint

Ubuntu

References · 46

• https://cve.org/CVERecord?id=CVE-2026-24031 · Security Note
• https://osv.dev/vulnerability/ALPINE-CVE-2026-24031 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-24031 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-24031 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-27856 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10442-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-27858 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-27859 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-59028 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:21208-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-27855 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-59031 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8136-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-24031 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-24031 · Vendor Advisory