ThemeREX Classter CVE-2025-54001
CRITICAL
Deserialization of Untrusted Data (CWE-502)
2026-03-05
audit@patchstack.com
9.8
CVSS 3.1 · NVD
Share
Severity by source
NVD
PRIMARY
9.8
CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Lifecycle Timeline
3
Re-analysis Queued
Apr 22, 2026 - 21:37 vuln.today
cvss_changed
Analysis Generated
Mar 12, 2026 - 22:06 vuln.today
CVE Published
Mar 05, 2026 - 06:16 nvd
CRITICAL 9.8
DescriptionCVE.org
Deserialization of Untrusted Data vulnerability in ThemeREX Classter classter allows Object Injection.This issue affects Classter: from n/a through <= 2.5.
AnalysisAI
Deserialization of untrusted data in Classter (classter) WordPress theme allows PHP Object Injection, potentially enabling remote code execution through POP chains.
Technical ContextAI
CWE-502 deserialization of untrusted data in classter. Attacker-controlled data is passed to unserialize(), enabling instantiation of arbitrary PHP objects.
Affected ProductsAI
Classter WordPress theme
RemediationAI
Update the theme. Avoid unserialize() on user input.
Share
External POC / Exploit Code
Leaving vuln.today
Destination URL
POC code from unknown sources may be malicious, contain backdoors, or be fake.
Always review and test exploit code in a safe, isolated environment (VM/sandbox).
Verify the source reputation and cross-reference with known databases (Exploit-DB, GitHub Security).