Reflected Cross-Site Scripting Vulnerability in Custom Block Builder Plugin for WordPress
CVE-2024-12878

7.1HIGH

Key Information:

Vendor

WordPress
Status
Custom Block Builder
Vendor
CVE Published:
26 February 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2024-12878?

The Custom Block Builder plugin for WordPress, prior to version 3.8.3, exposes a reflected cross-site scripting (XSS) vulnerability. This occurs because the plugin fails to properly sanitize and escape a parameter before rendering it on the web page. This flaw could potentially be exploited, particularly against users with high privileges, such as administrators, allowing attackers to inject malicious scripts.

Affected Version(s)

Custom Block Builder 0 < 3.8.3

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-2024-12878 - Proof of Concept

References

https://wpscan.com/vulnerability/827444d1-87cb-4057-827a-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
7.1
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Hassan Khan Yusufzai - Splint3r7
WPScan
.