CVE-2026-121863VulnerabilityPublished 11 Nov 2026

The Knowledge Building WordPress plugin before 0.7.3 does not escape several user-supplied values before echoing them

Source GCVE Database

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Authoritative record:CVE-2026-121863· High

Not known to be exploited : upgrade to 0.7.3 soon.

Data as of 11 Nov 2026, 07:33 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in 0.7.3

Exploitation evidence

Disclosed: evidence found.
CVE published 11 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-5542-wp67-24rf

What to do

Upgrade Knowledge Building (WordPress plugin) to 0.7.3.

Affected software

Product	Affected	Fixed in
Knowledge Building	Affected <0.7.3	Fixed in 0.7.3

AI-suggested

Upgrade the Knowledge Building WordPress plugin to version 0.7.3 or later, where this vulnerability is fixed by properly escaping user-supplied values before output. No other mitigation is indicated by the available data.

Description

The Knowledge Building WordPress plugin versions before 0.7.3 contain a reflected cross-site scripting (XSS) vulnerability. This occurs because several user-supplied values are not properly escaped before being echoed back in the response of an AJAX action accessible to unauthenticated users. The response is served as HTML, enabling potential injection of malicious scripts.

Impact

An attacker can exploit this vulnerability to execute arbitrary JavaScript in the context of users visiting a page that triggers the vulnerable AJAX action. This can lead to session hijacking, defacement, or redirection to malicious sites. Since the AJAX action is available to unauthenticated users, exploitation does not require prior access or credentials.

Summary

The Knowledge Building WordPress plugin prior to version 0.7.3 fails to escape multiple user-supplied inputs before outputting them in an AJAX response that is accessible without authentication. This improper handling results in a reflected cross-site scripting vulnerability, where malicious scripts can be injected and executed in the context of the victim's browser when they interact with the affected AJAX endpoint.

References

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