Cyber Resilience

CVE-2026-22417

CriticalRCE

Published: 05 March 2026

Published
05 March 2026
Modified
23 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 0.0051 39.5th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-22417 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 39.5th 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-2026-22417 is a Deserialization of Untrusted Data vulnerability (CWE-502) in the Grand Wedding WordPress theme developed by ThemeGoods, enabling object injection. The issue affects all versions of the grandwedding theme from its initial release through versions prior to 3.1.11. Published on March 5, 2026, it 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), classifying it as critical due to its potential for severe impact.

Remote attackers require no privileges or user interaction to exploit this vulnerability over the network with low complexity. Successful exploitation can result in high confidentiality, integrity, and availability impacts, potentially allowing arbitrary code execution or other severe consequences typical of PHP object injection in untrusted deserialization scenarios.

The Patchstack advisory for this vulnerability, accessible at the provided reference URL, details the object injection flaw in the Grand Wedding theme, specifically noting its presence in version 3.1.0 and earlier. Mitigation involves updating the theme to version 3.1.11 or later, where the deserialization issue has been addressed.

OWASP Top 10 for Web (2025)

A08:2025 Software or Data Integrity Failures

EU & UK References

Vulnerability details

Deserialization of Untrusted Data vulnerability in ThemeGoods Grand Wedding grandwedding allows Object Injection.This issue affects Grand Wedding: from n/a through < 3.1.11.

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?

Direct remote unauthenticated RCE via deserialization/object injection in a public-facing WordPress theme (CWE-502).

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

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CVE-2025-60039Shared CWE-502
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CVE-2025-7697Shared CWE-502

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-2 Flaw Remediation good match
prevent

Timely flaw remediation by updating the Grand Wedding WordPress theme to version 3.1.11 or later directly eliminates the deserialization of untrusted data vulnerability.

SI-10 Information Input Validation good match
prevent

Information input validation ensures untrusted data is sanitized and verified before deserialization, preventing object injection in the Grand Wedding theme.

RA-5 Vulnerability Monitoring and Scanning partial match
detect

Vulnerability monitoring and scanning identifies the deserialization flaw (CVE-2026-22417) in the Grand Wedding theme, enabling proactive patching.

References