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No exploitation reportedAwaiting NVD analysis

CVE-2026-121863

Knowledge Building < 0.7.3 - Reflected XSS via Comment Reply Response

No exploitation reported by the sources we read.

  • Published2026-11-11
  • WeaknessCWE-79

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-11-1106:00CVE publishedCNA

Versions per branch

Products declared by the CNA

As WPScan, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • Unknown Knowledge Buildingother versions: not affected
    Affected
    • < 0.7.3fixed in 0.7.3semver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-11

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-121863 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Published
2026-11-11
Last Modified
2026-11-11
NVD status
Received
GitHub Advisory
GHSA-5542-wp67-24rf

Frequently asked questions

What is CVE-2026-121863?

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.

Is CVE-2026-121863 actively exploited?

Active exploitation of CVE-2026-121863 has not been confirmed.

What is the CVSS score for CVE-2026-121863?

CVE-2026-121863 has a CVSS v3 base score of 7.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L.

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Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

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Sources for this record