Cyber Resilience

CVE-2026-25429

CriticalRCE

Published: 25 March 2026

Published
25 March 2026
Modified
24 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 0.0037 29.2th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-25429 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 29.2th 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-2026-25429 is a Deserialization of Untrusted Data vulnerability (CWE-502) in the wpdive Nexa Blocks WordPress plugin (nexa-blocks), which allows Object Injection. This issue affects Nexa Blocks versions from n/a through 1.1.1.

The vulnerability carries 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 it can be exploited over the network by unauthenticated attackers requiring low complexity and no user interaction. Successful exploitation enables high-impact disruption to confidentiality, integrity, and availability through object injection.

Mitigation details are available in the Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/nexa-blocks/vulnerability/wordpress-nexa-blocks-plugin-1-1-1-php-object-injection-vulnerability?_s_id=cve.

OWASP Top 10 for Web (2025)

A08:2025 Software or Data Integrity Failures

EU & UK References

Vulnerability details

Deserialization of Untrusted Data vulnerability in wpdive Nexa Blocks nexa-blocks allows Object Injection.This issue affects Nexa Blocks: from n/a through <= 1.1.1.

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?

Unauthenticated remote deserialization/object injection in a public-facing WordPress plugin directly enables initial access via exploitation of an internet-facing application.

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

CVEs Like This One

CVE-2025-62368Shared CWE-502
CVE-2025-68903Shared CWE-502
CVE-2025-67911Shared CWE-502
CVE-2025-54014Shared CWE-502
CVE-2026-22505Shared CWE-502
CVE-2025-53078Shared CWE-502
CVE-2026-43633Shared CWE-502
CVE-2025-60039Shared CWE-502
CVE-2025-7697Shared CWE-502
CVE-2026-22248Shared CWE-502

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-2 Flaw Remediation good match
prevent

Requires timely remediation and patching of the deserialization of untrusted data flaw in the Nexa Blocks WordPress plugin to eliminate the object injection vulnerability.

SI-10 Information Input Validation good match
prevent

Mandates validation of untrusted inputs at entry points to prevent malicious serialized data from being deserialized into objects.

SI-16 Memory Protection partial match
prevent

Implements memory protections to mitigate unauthorized code execution resulting from successful object injection via deserialization.

References