Critical severity · published Sep 30, 2026
CVE-2026-74864
Authentication Bypass in sogo_yhn
9.3
CVSS
0.4%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SO
sogo_yhn · YunoHost-Apps
before 5.8.0~ynh9 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-74864
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-74864
third-party-advisory
https://cert.pl/en/posts/2026/09/CVE-2026-74864
issue-tracking
https://forum.yunohost.org/t/sogo-critical-vulnerability-fixed-in-5-8-0-ynh9/42699
More from sogo_yhn
9.2
CVE-2026-74865
Authentication Bypass in sogo_yhn