CVE•Published 2026-03-27•Modified 2026-04-29•0 articles on news•5 live references•NVD data

CVE-2026-27860Dovecot · Dovecot

Vulnerability data via NVD (ingested)

CVSS v3.1

3.7

LOW

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS percentile

Exploit Prediction Scoring System · top 80% of all CVEs

Weaknesses (CWE)

CWE-90Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

Description

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.

Timeline

Published 2026-03-27

Modified 2026-04-29

External references

NVD MITRE Exploit-DB Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag181 hosts

vuln:CVE-2026-27860

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Dovecot Dovecot"

All exposed Dovecot Dovecot instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Dovecot"

HTTP body or banner mentions "Dovecot" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-27860