XSS in Yeswiki
CVE-2026-104466
YesWiki before 4.6.7 contains a stored cross-site scripting vulnerability in formatters/wakka.php that allows users who can edit pages or post comments to inject event handlers by placing quotes in markdown image URLs. Attackers can store a crafted markdown image whose src breaks out of the attribute to add an onerror handler, executing JavaScript in viewers' browsers, including administrators.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
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-7pv9-pwm8-cwwr (vendor-advisory)
- www.vulncheck.com/advisories/yeswiki-before-4.6.7-stored-xss-via-wakka-markdown… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-104466?
- CVE-2026-104466 is a medium-severity vulnerability in Yeswiki, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-10-02.
- How severe is CVE-2026-104466?
- Medium severity. CVSS v3 base score is 5.4 out of 10.