CVE-2026-27856
MEDIUM EPSS 21.1%
Published Mar 27, 20263mo ago · Modified Jun 17, 20262w ago
5.9 CVSS 3.1
Published Mar 27, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability None
Threat Intelligence
EPSS Exploit Probability
21.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-287 Improper Authentication Authentication
Affected Products 4
| Vendor | Product | Version | Range |
|---|---|---|---|
| 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 |
References 1
- documentation.open-xchange.com https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.