Cyber Resilience

CVE-2025-53242

CriticalRCE

Published: 06 November 2025

Published
06 November 2025
Modified
15 April 2026
KEV Added
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Patch
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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0010 27.4th percentile
Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-53242 is a critical-severity Deserialization of Untrusted Data (CWE-502) vulnerability. Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 27.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 RA-5 (Vulnerability Monitoring and Scanning) and SI-10 (Information Input Validation).

Deeper analysis

CVE-2025-53242 is a Deserialization of Untrusted Data vulnerability (CWE-502) in the VictorThemes Seil WordPress theme, enabling Object Injection. This issue affects Seil versions from n/a through 1.7.1 and was published on 2025-11-06.

With a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), the vulnerability can be exploited over the network by unauthenticated attackers requiring low complexity and no user interaction. Successful exploitation could lead to high impacts on confidentiality, integrity, and availability, potentially allowing arbitrary code execution or full theme compromise on affected WordPress sites.

Patchstack has documented the vulnerability in its database for the Seil theme version 1.7.1, providing details at https://patchstack.com/database/Wordpress/Theme/seil/vulnerability/wordpress-seil-theme-1-7-1-deserialization-of-untrusted-data-vulnerability?_s_id=cve.

EU & UK References

Vulnerability details

Deserialization of Untrusted Data vulnerability in VictorThemes Seil seil allows Object Injection.This issue affects Seil: from n/a through <= 1.7.1.

CWE(s)
CWE-502

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

CVE-2025-53242 is a high-severity deserialization vulnerability in a public-facing WordPress theme exploitable remotely without authentication, enabling arbitrary code execution and directly facilitating T1190: Exploit Public-Facing Application.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2024-13770Shared CWE-502
CVE-2026-27303Shared CWE-502
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CVE-2025-64353Shared CWE-502
CVE-2025-31047Shared CWE-502
CVE-2026-27096Shared CWE-502
CVE-2023-49886Shared CWE-502
CVE-2026-23542Shared CWE-502
CVE-2025-66631Shared CWE-502
CVE-2026-40044Shared CWE-502

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-2 Flaw Remediation good match
prevent

Directly requires timely identification, reporting, and correction of the deserialization of untrusted data flaw in the vulnerable Seil WordPress theme versions.

SI-10 Information Input Validation good match
prevent

Enforces validation and error handling of untrusted inputs at critical entry points to block object injection exploits from deserialization.

RA-5 Vulnerability Monitoring and Scanning good match
detect

Scans systems for vulnerabilities such as CVE-2025-53242 in WordPress themes to identify and prioritize remediation of the deserialization issue.

References