Dashboard / CVE-2026-27860

CVE-2026-27860

MEDIUM
MEDIUM Priority: 0.02 BB Relevance: 71/100
Published: 2026-03-27 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: Low
I: None
A: None

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.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
dovecot dovecot < 2.4.3
open-xchange dovecot < 3.1.4

References & Advisories (1)

Bug Bounty Relevance

71 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

5.3 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS — Exploitation Probability

0.30%
Raw Score 0.002970
Percentile 22.4%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00297
2026-10-28
0.00297

Intelligence Sources

nvd ref →

External Links