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CVE-2026-27860

low CVSS 3.7 EPSS 0.3%

If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication. This leads to potentially bypassing restrictions and allows probing of LDAP structure. Do not clear out auth_username_chars, or install fixed version. No publicly available exploits are known.

Versions it affects

Software versions checked with the free lookup that CVE-2026-27860 applies to, and the release that fixes it where the sources name one.

Dovecot 2.2.36

At a glance

Severity
Low
CVSS base score
3.7 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.3% probability of exploitation in the next 30 days, higher than 21% of scored vulnerabilities
Weakness
CWE-90
Published
2026-03-27
NVD CVE.org

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