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.

INFO

Published Date :

2026-03-27T08:10:19.537Z

Last Modified :

2026-03-27T13:45:12.231Z

Source :

OX
AFFECTED PRODUCTS

The following products are affected by CVE-2026-27856 vulnerability.

Vendors Products
Dovecot
  • Dovecot
Open-xchange
  • Dovecot
  • Ox Dovecot Pro
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-27856.

URL Resource
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-27856 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-27856 cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
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Privileges Required
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Integrity Impact
Availability Impact