Dashboard / CVE-2026-40020

CVE-2026-40020

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 59/100
Published: 2026-05-12 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: Low
UI: None
S: Unchanged
C: None
I: None
A: Low

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.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
dovecot dovecot < 2.4.4
open-xchange dovecot < 3.1.5

References & Advisories (1)

Bug Bounty Relevance

59 / 100
✓ Network accessible
✓ Low complexity
✓ No user interaction

CVSS Score

4.3 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

EPSS — Exploitation Probability

0.26%
Raw Score 0.002600
Percentile 17.8%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00260
2026-10-28
0.00260

Intelligence Sources

nvd ref →

External Links