Cyber Resilience

CVE-2025-49393

CriticalRCE

Published: 06 November 2025

Published
06 November 2025
Modified
15 April 2026
KEV Added
—
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-2025-49393 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 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2025-49393 is a Deserialization of Untrusted Data vulnerability (CWE-502) in the Fetch Designs Sign-up Sheets WordPress plugin (sign-up-sheets), enabling PHP Object Injection. The issue affects all versions of the plugin up to and including 2.3.2. It has 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), indicating critical severity due to its potential for high impact on confidentiality, integrity, and availability.

Unauthenticated remote attackers can exploit this vulnerability over the network with low complexity and no user interaction required. By supplying malicious serialized data, attackers can trigger object injection, potentially leading to arbitrary code execution, data manipulation, or server compromise, as reflected in the high-impact CVSS vector.

The Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/sign-up-sheets/vulnerability/wordpress-sign-up-sheets-plugin-2-3-2-php-object-injection-vulnerability?_s_id=cve details the vulnerability in the WordPress Sign-up Sheets plugin version 2.3.2 and provides information on mitigation, likely including updating to a patched version where available.

EU & UK References

Vulnerability details

Deserialization of Untrusted Data vulnerability in Fetch Designs Sign-up Sheets sign-up-sheets allows Object Injection.This issue affects Sign-up Sheets: from n/a through <= 2.3.2.

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 an unauthenticated remote deserialization flaw in a public-facing WordPress plugin, directly enabling exploitation of a public-facing application for arbitrary code execution.

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

CVEs Like This One

CVE-2024-13770Shared CWE-502
CVE-2026-27303Shared CWE-502
CVE-2025-53586Shared CWE-502
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

Patching the Sign-up Sheets WordPress plugin beyond version 2.3.2 directly remediates the PHP object injection vulnerability from deserialization of untrusted data.

SI-10 Information Input Validation good match
prevent

Validating untrusted inputs at deserialization points prevents processing of malicious serialized data that triggers object injection in the plugin.

SI-16 Memory Protection partial match
prevent

Memory protection mechanisms like ASLR and DEP mitigate arbitrary code execution resulting from successful PHP object injection.

References