CVE-2026-121863 · Other
NO FIX YET · SEE WHAT TO DO
The Knowledge Building WordPress plugin before 0.7.3 echoes several user-supplied values back unescaped in an AJAX response served as HTML. An attacker can craft a link that runs script in a visitor's browser, in the context of the affected site.
first public Nov 11, 2026 · 1 source
Could this affect your app?
Free first check from your website. Connect your repo for the full answer.
Sites running the Knowledge Building WordPress plugin before 0.7.3. The AJAX action is available to unauthenticated users, so no login is needed to reach the vulnerable response. Sites without this plugin can skip it.
Not affected if plugin-not-installed, version-0.7.3-or-later
Who cares knowledge-building, wordpress
0.7.3 are affected.0.7.3 or later, per the advisory's stated fixed version.The Knowledge Building WordPress plugin before 0.7.3 does not escape several user-supplied values before echoing them back in the response of an AJAX action available to unauthenticated users, and serves that response as HTML, leading to a Reflected Cross-Site Scripting.
NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.
Check it with your coding agent
It reads this page and tells you if your code is affected.
Are you affected?
Ask from here. InfraStack checks the affected versions against your stack and answers in your inbox.
InfraStack checks the affected versions against your stack and answers in Slack, with the evidence and the fix.