CVE-2025-54001

CRITICAL 9.8

WordPress Classter theme <= 2.5 - PHP Object Injection vulnerability

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

Deserialization of Untrusted Data vulnerability in ThemeREX Classter classter allows Object Injection.This issue affects Classter: from n/a through <= 2.5.

CWE	CWE-502
Vendor	themerex
Product	classter
Published	Mar 5, 2026
Last Updated	Apr 1, 2026

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Affected Versions

ThemeREX / Classter

0 ≤ 2.5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

patchstack.com: https://patchstack.com/database/Wordpress/Theme/classter/vulnerability/wordpress-classter-theme-2-5-php-object-injection-vulnerability?_s_id=cve

Credits

Tran Nguyen Bao Khanh (VCI - VNPT Cyber Immunity) | Patchstack Bug Bounty Program