CVE-2026-104446 YesWiki before 4.6.7 Unauthenticated Open Mail Relay via Contact Mail Handler
Unauthenticated attackers can bypass authentication in the contact mail handler to send arbitrary emails via the wiki's SMTP server.
- 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-2026-104446?
CVE-2026-104446 is a medium-severity authentication bypass vulnerability in yeswiki, published on 2 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
YesWiki before 4.6.7 contains an authentication bypass in the contact mail AJAX handler that allows unauthenticated attackers to send email through the wiki's SMTP server. Attackers can POST an XMLHttpRequest to the mail handler without field or type parameters, supplying arbitrary recipient, sender, subject and body for spam and phishing.
Weakness: CWE-306
Which versions are affected by CVE-2026-104446?
How do I fix CVE-2026-104446?
No fix has been published for CVE-2026-104446 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-2026-104446 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104446 exists.
Sources
Also known as GHSA-36fx-49jj-57rw, GHSA-c595-8pv9-m3vm.