Description
Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_allow_anyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed version. No publicly available exploits are known.
Published: 2026-05-12
Score: 3.1 Low
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 12 May 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Open-xchange
Open-xchange ox Dovecot Pro
Vendors & Products Open-xchange
Open-xchange ox Dovecot Pro

Tue, 12 May 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 12 May 2026 15:45:00 +0000

Type Values Removed Values Added
Title IMAP SETACL Allows Injection of Anyone Permission in Dovecot ACL File

Tue, 12 May 2026 14:00:00 +0000

Type Values Removed Values Added
Description Attacker can use the IMAP SETACL command to inject the anyone permission to user's dovecot-acl file even if imap_acl_allow_anyone=no. This causes folders to be spammed to all users. The impact is limited to being able to spam folders to other users, no unexpected access is gained. Install to fixed version. No publicly available exploits are known.
Weaknesses CWE-284
References
Metrics cvssV3_1

{'score': 3.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L'}


Subscriptions

Open-xchange Ox Dovecot Pro
cve-icon MITRE

Status: PUBLISHED

Assigner: OX

Published:

Updated: 2026-05-12T15:40:12.510Z

Reserved: 2026-04-08T09:59:59.342Z

Link: CVE-2026-40020

cve-icon Vulnrichment

Updated: 2026-05-12T15:40:08.183Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-05-12T14:17:03.687

Modified: 2026-05-12T15:08:22.857

Link: CVE-2026-40020

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-12T16:30:19Z

Weaknesses