CVE-2026-74864
Authentication Bypass in sogo_yhn
- State
- Published
- Severity
- 9.3 Critical
- Published
- Sep 30, 2026
- Updated
- Sep 30, 2026
- Reserved
- Aug 17, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | CERT-PL |
Weaknesses
- CWE-639 Authorization bypass through User-Controlled key
Affected Products
| Product | Versions |
|---|---|
sogo_yhnYunoHost-Apps |
|
References
- https://cert.pl/en/posts/2026/09/CVE-2026-74864third-party-advisory
- https://forum.yunohost.org/t/sogo-critical-vulnerability-fixed-in-5-8-0-ynh9/42699issue-tracking
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