Auth bypass in Yeswiki
CVE-2026-104446
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/YesWiki/yeswiki/security/advisories/GHSA-36fx-49jj-57rw (vendor-advisory)
- www.vulncheck.com/advisories/yeswiki-before-4.6.7-unauthenticated-open-mail-rel… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-104446?
- CVE-2026-104446 is a medium-severity vulnerability in Yeswiki, classified under Missing Authentication for Critical Function. CVSS score: 6.5/10. Published 2026-10-02.
- How severe is CVE-2026-104446?
- Medium severity. CVSS v3 base score is 6.5 out of 10.