CVE-2026-40020

4.3 Moyenne

Publiée le 12/05/2026 à 16:17 · Modifiée le 17/06/2026 à 12:44 · Analysée par le NVD · Source : security@open-xchange.com

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.

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Produits concernés

Open-Xchange GmbH OX Dovecot Pro
Dovecot dovecot
Open-xchange dovecot

Scores CVSS

Version	Score	Source	Vecteur
3.1	3.1 Faible	security@open-xchange.com	`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L`
3.1	4.3 Moyenne	nvd@nist.gov (NVD)	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L`

Faiblesses (CWE)

CWE-284

Références

https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0002.json Vendor Advisory

Ailleurs

NVD
CVE.org
CIRCL Vulnerability-Lookup
CERT-FR
GitHub Advisories