CVE-2026-121862: high-severity vulnerability in Knowledge Building
Knowledge Building < 0.7.3 - Unauthenticated Stored XSS via knbu_new_reply AJAX Action
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
18Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8
The Knowledge Building WordPress plugin before 0.7.3 does not sanitise and escape comments submitted through its reply feature, and publishes them without moderation, allowing unauthenticated users to perform Stored Cross-Site Scripting attacks against any visitor of the affected posts, including administrators.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products
Unknown · Knowledge BuildingRelated CVEs — Knowledge Building
In the same product, most dangerous first.