CVEvulnerability

CVE-2026-27856

5.9 MEDIUM Published 2026-03-27 Modified 2026-10-26 Official page ↗
Status
Modified
Published
2026-03-27
Last modified
2026-10-26
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.4 HIGH — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS 3.1 ([email protected])
5.9 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 3.1 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)
7.4 HIGH — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weaknesses
CWE-208, CWE-287

Description

Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials. Figuring out the credential will lead into full access to the affected component. Limit access to the doveadm http service port, install fixed version. No publicly available exploits are known.

Affected configurations

• dovecot dovecot (< 2.4.3) • open-xchange dovecot (< 2.3.22.1) • open-xchange dovecot (>= 3.0.0 < 3.0.5) • open-xchange dovecot (>= 3.1.0 < 3.1.4)

Related

Weakness · CWE (2)

  • CWE-208 Observable Timing Discrepancy weakness
  • CWE-287 Improper Authentication weakness

References