CVE-2026-104466

Description

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.

CVSS Vector

References

• https://github.com/YesWiki/yeswiki/security/advisories/GHSA-7pv9-pwm8-cwwr
• https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-stored-xss-via-wakka-markdown-image-src-attribute
• https://github.com/YesWiki/yeswiki/security/advisories/GHSA-7pv9-pwm8-cwwr