CVE-2026-74864: Yunohost-Apps Sogo Yhn

Critical severity, CVSS 9.3. EPSS: 0.4% chance of exploitation in the next 30 days.

sogo_yhn configures SOGo with a parameter that forces the request with HTTP header "x-webobjects-remote-user" to be treated as sent by a verified user without performing password validation. Since Nginx does not strip this header, any client can supply it arbitrarily and gain access as any user, including a privileged user, without providing a password. This issue was fixed in version 5.8.0~ynh9.

Affected products

• Yunohost-Apps Sogo Yhn: before 5.8.0~ynh9 (fixed in 5.8.0~ynh9)

Published 2026-09-30. Last modified 2026-09-30.