by Kastro
Paper/Archive/CVE-2026-74864

CVE-2026-74864

YunoHost-Apps sogo_yhn — Authentication Bypass in sogo_yhn

EPSS 0.4%CVSS 9.3
critical.is priorityof 100
35
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 34.9.349 × 207.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
sogo_yhn< 5.8.0~ynh95.8.0~ynh9CNA

Scores by source

CERT-PL (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

writeupcert.pl/en/posts/2026/09/CVE-2026-74864refforum.yunohost.org/t/sogo-critical-vulnerability-fixed-in-5-8-0-ynh9/42699