VULNERABILITY INTELLIGENCE

CVE-2026-40016

CVSS score5.3 MEDIUM
EPSS probability0.34%
CISA KEVNot currently listed
Published2026-05-12
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Description

Attacker can upload a malicious Sieve script over ManageSieve service (or locally) to bypass configured CPU time limits for Sieve up to 130 times of the configured limit. Attacker can use this to degrade server performance and bypass configured CPU time limits for Sieve scripts. Install fixed version, or alternatively prevent direct access to Sieve scripts via ManageSieve or local access. No publicly available exploits are known.

Weakness classification

  • security@open-xchange.com: CWE-400

Primary references