Cyber Resilience

CVE-2025-52740

HighRCE

Published: 22 October 2025

Published
22 October 2025
Modified
15 April 2026
KEV Added
—
Patch
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CVSS Score v3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0017 38.7th percentile
Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-52740 is a high-severity Deserialization of Untrusted Data (CWE-502) vulnerability. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 38.7th 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 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2025-52740 is a Deserialization of Untrusted Data vulnerability (CWE-502) in the Boldermail WordPress plugin developed by Hernan Villanueva, enabling PHP Object Injection. The issue affects Boldermail versions from n/a through 2.4.0 inclusive. Published on 2025-10-22, it carries a CVSS 3.1 base score of 8.8 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), indicating high severity due to its potential for significant impact.

The vulnerability can be exploited remotely over the network by an attacker with low privileges, such as an authenticated user, requiring low complexity and no user interaction. Successful exploitation allows the attacker to achieve high confidentiality, integrity, and availability impacts, potentially leading to full system compromise through object injection.

Mitigation details are available in the Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/boldermail/vulnerability/wordpress-boldermail-plugin-2-4-0-php-object-injection-vulnerability?_s_id=cve.

EU & UK References

Vulnerability details

Deserialization of Untrusted Data vulnerability in Hernan Villanueva Boldermail boldermail allows Object Injection.This issue affects Boldermail: from n/a through <= 2.4.0.

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?

The vulnerability is a network-accessible deserialization flaw (CWE-502) in a WordPress plugin exploitable by low-privileged users, directly enabling exploitation of a public-facing application.

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

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CVE-2026-23542Shared CWE-502
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CVE-2026-40044Shared CWE-502

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-2 Flaw Remediation good match
prevent

Timely flaw remediation patches the deserialization of untrusted data vulnerability in Boldermail <=2.4.0, directly preventing PHP object injection exploitation.

SI-10 Information Input Validation good match
prevent

Information input validation rejects or sanitizes untrusted serialized data before deserialization, blocking malicious object injection in the Boldermail plugin.

RA-5 Vulnerability Monitoring and Scanning partial match
preventdetect

Vulnerability scanning identifies the Boldermail plugin vulnerability (CVE-2025-52740), enabling detection and prioritized remediation.

References