Cyber Resilience

CVE-2026-22440

High

Published: 05 March 2026

Published
05 March 2026
Modified
22 April 2026
KEV Added
—
Patch
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CVSS Score v3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
EPSS Score 0.0004 14.4th percentile
Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-22440 is a high-severity Cross-site Scripting (CWE-79) vulnerability. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 14.4th 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-15 (Information Output Filtering).

Deeper analysis

CVE-2026-22440 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, in the Thecs WordPress theme developed by foreverpinetree. This issue affects Thecs versions from n/a through 1.4.7 inclusive, as published on 2026-03-05.

The vulnerability carries a CVSS v3.1 base score of 7.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L). Remote attackers with network access can exploit it with low attack complexity and no privileges required, though user interaction is needed, such as visiting a maliciously crafted link. Exploitation enables script injection into reflected web pages, achieving low impacts on confidentiality, integrity, and availability within a changed security scope.

The Patchstack advisory at https://patchstack.com/database/Wordpress/Theme/thecs/vulnerability/wordpress-thecs-theme-1-4-7-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve details the Reflected XSS in Thecs up to version 1.4.7, recommending mitigation through updating to a version beyond 1.4.7 where available.

EU & UK References

Vulnerability details

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in foreverpinetree Thecs thecs allows Reflected XSS.This issue affects Thecs: from n/a through <= 1.4.7.

CWE(s)
CWE-79

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?

Reflected XSS in public-facing WordPress theme directly enables exploitation of a web application vulnerability (T1190).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

CVEs Like This One

CVE-2021-47873Shared CWE-79
CVE-2026-7052Shared CWE-79
CVE-2024-56060Shared CWE-79
CVE-2025-49043Shared CWE-79
CVE-2026-40038Shared CWE-79
CVE-2024-56022Shared CWE-79
CVE-2025-68889Shared CWE-79
CVE-2026-1074Shared CWE-79
CVE-2025-22539Shared CWE-79
CVE-2025-22286Shared CWE-79

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly requires validation and neutralization of untrusted input before it is reflected into web page output, blocking the CWE-79 flaw in Thecs <=1.4.7.

SI-15 Information Output Filtering good match
prevent

Requires filtering of information output to remove or encode script content, preventing reflected XSS payloads from executing in the victim's browser.

SI-2 Flaw Remediation good match
prevent

Mandates timely remediation of known software flaws, directly addressed by updating Thecs beyond version 1.4.7 as recommended in the advisory.

References