CVE-2026-121862

Knowledge Building < 0.7.3 - Unauthenticated Stored XSS via knbu_new_reply AJAX Action

Published Nov 11, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, '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': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

Type Values Removed Values Added
Description 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.
Title Knowledge Building < 0.7.3 - Unauthenticated Stored XSS via knbu_new_reply AJAX Action
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
WPScan
Published
Updated
Nov 11, 2026, 11:37 AM
Reserved
Nov 4, 2026, 9:44 AM
Status
Deferred
Published
Nov 11, 2026, 6:17 AM
Modified
Nov 12, 2026, 6:44 PM