What’s Vulnerable › Vulnerabilities

CVE-2026-74864: Authentication Bypass in sogo_yhn

• Severity: critical (CVSS 9.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-30 · updated 2026-09-30
• Weakness: CWE-639

Description

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

How to fix

Upgrade to a fixed version: YunoHost-Apps sogo_yhn 5.8.0~ynh9. Check the vendor advisory for mitigations.

References

• https://cert.pl/en/posts/2026/09/CVE-2026-74864
• https://forum.yunohost.org/t/sogo-critical-vulnerability-fixed-in-5-8-0-ynh9/42699

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