Critical Pre-Auth RCE Vulnerability CVE-2026-118633 Affects All Sophos UTM Versions, Manual Patch Required After EOL
Sophos has disclosed a critical remote code execution vulnerability in its legacy Sophos UTM security gateway product. The flaw, tracked as CVE-2026-118633, carries a CVSSv4.0 base score of 9.2 and is rated Critical. It allows unauthenticated attackers to execute arbitrary commands as root by triggering a race condition through repeated attacks against the email proxy when scanning is enabled. Although the product reached end-of-life, Sophos released a manual patch that users must apply themselves because automatic updates are no longer available. The company urges immediate patching for any deployments still using the email protection feature and recommends migration to the supported Sophos Firewall. The issue was reported through Sophos’s bug bounty program by an external researcher.
Security NEXTOct 29, 2026Translated from Japanese