Stored Cross-Site Scripting in Knowledge Building WordPress Plugin
CVE-2026-121862

Currently unrated

Key Information:

Vendor

WordPress
Status
Knowledge Building
Vendor
CVE Published:
11 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-121862?

The Knowledge Building WordPress plugin versions prior to 0.7.3 allows attackers to exploit a vulnerability stemming from inadequate sanitization and escaping of user-submitted comments. This oversight enables unauthenticated users to embed malicious scripts within the comments, facilitating Stored Cross-Site Scripting attacks. Consequently, these scripts are executed in the browsers of visitors to the affected posts, which can include administrators, thereby compromising user security and website integrity.

Affected Version(s)

Knowledge Building 0 < 0.7.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-121862 - Proof of Concept

References

https://wpscan.com/vulnerability/2656cb05-7d95-4e82-acb4-...
exploitvdb-entrytechnical-description

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Enrico Marcolini
Claudio Marchesini
Dottor Marc
WPScan
.