CVE-2026-24031

high

Published 2026-03-27 · Modified 2026-04-29

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CVSS v3

8.2

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

CVSS v4 NEW

—

not yet in upstream

VIR risk

8.2

Description

Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin. This vulnerability allows bypassing authentication for any user and user enumeration. Do not clear auth_username_chars. If this is not possible, install latest fixed version. No publicly available exploits are known.

Predictions

Exploit likelihood

88%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

OS	Version	Status	Fixed in
debian	bookworm	fixed	`0`
debian	bullseye	fixed	`0`
debian	forky	fixed	`1:2.4.3+dfsg1-1`
debian	sid	fixed	`1:2.4.3+dfsg1-1`
debian	trixie	fixed	`1:2.4.1+dfsg1-6+deb13u4`
sles		affected

Application impact

Vendor	Product	Versions	Fixed
dovecot	dovecot	`{"endExcluding":"2.4.3"}`	`2.4.3`
open-xchange	dovecot	`{"endExcluding":"3.1.4"}`	`3.1.4`

References

CWEs

CWE-89

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.