CVE-2026-40204
published 2026-08-28CVE-2026-40204: None None None No publicly available exploits are known.
PriorityP412low3.1CVSS 3.1
AVNACHPRLUINSUCNILAN
EPSS
0.21%
10.8th percentile
None None None No publicly available exploits are known.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| dovecot | dovecot | — | — |
| open-xchange_gmbh | ox_dovecot_ce | >= 2.3.0 < 2.4.5 | 2.4.5 |
| open-xchange_gmbh | ox_dovecot_pro | >= 2.3.0 < 2.3.22.2 | 2.3.22.2 |
| open-xchange_gmbh | ox_dovecot_pro | >= 3.0.0 < 3.0.7 | 3.0.7 |
| open-xchange_gmbh | ox_dovecot_pro | >= 3.1.0 < 3.1.6 | 3.1.6 |
CVSS provenance
nvdv3.13.1LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
vendor_redhat3.1LOW
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Red Hat
dovecot: dovecot: lda_mailbox_autocreate can bypass acl restrictions
vendor_redhat·2026-08-28·CVSS 3.1
CVE-2026-40204 [LOW] CWE-1220 dovecot: dovecot: lda_mailbox_autocreate can bypass acl restrictions
dovecot: dovecot: lda_mailbox_autocreate can bypass acl restrictions
None None None No publicly available exploits are known.
A flaw was found in Dovecot. This vulnerability allows an attacker to bypass Access Control List (ACL) restrictions through the `lda_mailbox_autocreate` feature. This could potentially grant unauthorized access to mailboxes or other restricted resources.
Mitigation: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Package: dovecot (Red Hat Enterprise Linux 10) - Fix deferred
Package: dovecot (Red Hat Enterprise Linux 6) - Out of support scope
Package: dovecot (Red Hat Enterpris
VulDB
Open-Xchange Dovecot Pro/Dovecot CE access control (Nessus ID 341510 / WID-SEC-2026-3076)
vuldb·2026-09-07·CVSS 3.1
CVE-2026-40204 [LOW] Open-Xchange Dovecot Pro/Dovecot CE access control (Nessus ID 341510 / WID-SEC-2026-3076)
A vulnerability was found in Open-Xchange Dovecot Pro and Dovecot CE and classified as problematic. This impacts an unknown function. Such manipulation leads to improper access controls.
This vulnerability is referenced as CVE-2026-40204. It is possible to launch the attack remotely. No exploit is available.
GHSA
None None None No publicly available exploits are known.
ghsa_unreviewed·2026-08-28
CVE-2026-40204 [LOW] CWE-284 None None None No publicly available exploits are known.
None None None No publicly available exploits are known.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-40204 dovecot: dovecot: lda_mailbox_autocreate can bypass acl restrictions [fedora-all]
bugzilla·2026-09-01·CVSS 3.1
CVE-2026-40204 [LOW] CVE-2026-40204 dovecot: dovecot: lda_mailbox_autocreate can bypass acl restrictions [fedora-all]
CVE-2026-40204 dovecot: dovecot: lda_mailbox_autocreate can bypass acl restrictions [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
None None None No publicly available exploits are known.
Bugzilla
CVE-2026-40204 dovecot: dovecot: lda_mailbox_autocreate can bypass acl restrictions
bugzilla·2026-08-28·CVSS 3.1
CVE-2026-40204 [LOW] CVE-2026-40204 dovecot: dovecot: lda_mailbox_autocreate can bypass acl restrictions
CVE-2026-40204 dovecot: dovecot: lda_mailbox_autocreate can bypass acl restrictions
None None None No publicly available exploits are known.
2026-08-28
Published