Vulnerability · Published Feb 26, 2025 · Assigned by WPScan
CVE-2024-12878Custom Block Builder – Lazy Blocks < 3.8.3 - Reflected XSS
High 7.1
In plain English
A high-severity security flaw in Custom Block Builder from Unknown. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei.
Severity (CVSS 3.1)7.1High
Exploit odds (30 days)0.6%top 50.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack tooling1Nuclei
Official description
The Custom Block Builder WordPress plugin before 3.8.3 does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Unknown | Custom Block Builder | 0 – before 3.8.3 |
References
- https://wpscan.com/vulnerability/827444d1-87cb-4057-827a-d802eac82cf8/ exploit, vdb-entry, technical-description