Platform
linux
Component
dovecot
Fixed in
3.1.1
2.4.1
CVE-2026-24031 describes a SQL injection vulnerability in Dovecot's SQL-based authentication mechanism. This flaw allows attackers to bypass authentication controls and potentially enumerate users. The vulnerability impacts Dovecot versions from 0.0 up to and including 3.1.0. Administrators are advised to upgrade to a patched version or implement a workaround to mitigate the risk.
The primary impact of CVE-2026-24031 is the ability for an attacker to bypass Dovecot's authentication process. By manipulating the authusernamechars setting, an attacker can inject malicious SQL code, effectively bypassing the need for valid credentials. This can lead to unauthorized access to mailboxes and other sensitive data stored within Dovecot. Successful exploitation could also enable user enumeration, revealing valid usernames within the system, which could be used in subsequent attacks. The blast radius extends to any system relying on Dovecot for authentication, potentially impacting email services and related applications.
As of the publication date (2026-03-27), no publicly available exploits have been identified for CVE-2026-24031. The vulnerability is not currently listed on CISA KEV. The risk is considered moderate due to the potential for authentication bypass and data exposure, but the lack of public exploits reduces the immediate threat. Monitor security advisories and threat intelligence feeds for any updates.
Exploit Status
EPSS
0.06% (20% percentile)
CISA SSVC
CVSS Vector
The most effective mitigation for CVE-2026-24031 is to upgrade Dovecot to a version containing the fix. Consult the Dovecot project's website for the latest stable release. If upgrading immediately is not feasible, administrators should ensure that the authusernamechars setting is not cleared. This setting should be configured to prevent SQL injection attempts. As a temporary workaround, consider implementing a Web Application Firewall (WAF) rule to filter potentially malicious SQL queries targeting the authentication endpoint. Monitor Dovecot logs for suspicious SQL activity.
Do not clear the auth_username_chars configuration. If this is not possible, install the latest fixed version of Dovecot. Consult the vendor documentation for more details on updating.
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CVE-2026-24031 is a SQL injection vulnerability in Dovecot's authentication process, allowing attackers to bypass authentication and potentially enumerate users if authusernamechars is cleared.
If you are using Dovecot versions 0.0 through 3.1.0 and have cleared the authusernamechars setting, you are likely affected by this vulnerability.
Upgrade Dovecot to a patched version. If immediate upgrade is not possible, ensure authusernamechars is not cleared and consider a WAF.
As of the publication date, no public exploits are known, but the vulnerability poses a risk if not addressed.
Refer to the Dovecot project's website and security advisories for the latest information and updates regarding CVE-2026-24031.
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