CVE-2026-121863

Knowledge Building < 0.7.3 - Reflected XSS via Comment Reply Response

Published Nov 11, 2026 CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Wordpress-extensions
Wordpress-extensions knowledge Building
Vendors & Products Wordpress-extensions
Wordpress-extensions knowledge Building
Type Values Removed Values Added
Weaknesses CWE-79
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L'}

Type Values Removed Values Added
Description 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.
Title Knowledge Building < 0.7.3 - Reflected XSS via Comment Reply Response
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
WPScan
Published
Updated
Nov 11, 2026, 11:36 AM
Reserved
Nov 4, 2026, 9:44 AM
Status
Deferred
Published
Nov 11, 2026, 6:17 AM
Modified
Nov 12, 2026, 6:44 PM