CVE-2026-74865 Authentication Bypass in sogo_yhn
An unauthenticated attacker can bypass authentication and log in as any user by providing a valid username and arbitrary password due to proxy trust configuration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-74865?
CVE-2026-74865 is a critical authentication bypass vulnerability in YunoHost-Apps sogo_yhn, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
sogo_yhn configures SOGo with a parameter "SOGoTrustProxyAuthentication=YES". This causes the password to be bypassed during HTTP Basic authentication. An unauthenticated attacker who provides the username of an existing user and any arbitrary password can successfully log in to that user's account.
This issue was fixed in version 5.8.0~ynh9.
Weakness: CWE-639
Which versions are affected by CVE-2026-74865?
How do I fix CVE-2026-74865?
No fix has been published for CVE-2026-74865 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-74865 being exploited?
There is no known exploitation of CVE-2026-74865 in the wild and no public exploit code.
Sources
Also known as GHSA-jfr8-42vv-2p3v.