CVE-2026-27856

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.

PUBLISHED Reserved 2026-02-24 | Published 2026-03-27 | Updated 2026-03-27 | Assigner OX

Problem types

Improper Authentication

Product status

References

documentation.open-xchange.com/...26/oxdc-adv-2026-0001.json vendor-advisory

cve.org (CVE-2026-27856)

nvd.nist.gov (CVE-2026-27856)

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