Cyber Resilience

CVE-2026-25306

High

Published: 25 March 2026

Published
25 March 2026
Modified
24 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-2026-25306 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-2026-25306 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, in the 8theme XStore Core et-core-plugin for WordPress. This issue affects XStore Core versions from an unspecified initial release through 5.6.4.

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), indicating network accessibility, low attack complexity, no required privileges, and user interaction such as clicking a malicious link. Remote attackers can exploit it by crafting inputs that reflect malicious scripts in web page generation, achieving low impacts on confidentiality, integrity, and availability with a changed scope, typically enabling client-side effects like session hijacking or data exfiltration in the victim's browser context.

Mitigation details are available in the Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/et-core-plugin/vulnerability/wordpress-xstore-core-plugin-5-6-4-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve.

EU & UK References

Vulnerability details

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in 8theme XStore Core et-core-plugin allows Reflected XSS.This issue affects XStore Core: from n/a through <= 5.6.4.

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 →
T1185 Browser Session Hijacking Collection
Adversaries may take advantage of security vulnerabilities and inherent functionality in browser software to change content, modify user-behaviors, and intercept information as part of various browser session hijacking techniques.
attack.mitre.org →
T1539 Steal Web Session Cookie Credential Access
An adversary may steal web application or service session cookies and use them to gain access to web applications or Internet services as an authenticated user without needing credentials.
attack.mitre.org →
T1550.004 Web Session Cookie Lateral Movement
Adversaries can use stolen session cookies to authenticate to web applications and services.
attack.mitre.org →
Why these techniques?

Reflected XSS in public-facing WordPress plugin directly enables T1190 (exploiting the web app via crafted input/link). Injected JS facilitates T1185 (browser session hijacking), T1539 (stealing web session cookies), and T1550.004 (reusing stolen cookies as alternate auth material), matching the described client-side impacts.

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

CVEs Like This One

CVE-2018-25248Shared CWE-79
CVE-2025-68008Shared CWE-79
CVE-2025-0817Shared CWE-79
CVE-2024-55227Shared CWE-79
CVE-2025-0601Shared CWE-79
CVE-2026-27196Shared CWE-79
CVE-2026-2072Shared CWE-79
CVE-2026-32728Shared CWE-79
CVE-2025-25169Shared CWE-79
CVE-2025-68887Shared CWE-79

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-15 Information Output Filtering good match
prevent

Filters information outputs during web page generation to neutralize malicious scripts reflected from user inputs, directly addressing the improper neutralization in this reflected XSS vulnerability.

SI-10 Information Input Validation good match
prevent

Validates inputs to the WordPress plugin to block malicious payloads before they are processed and reflected in generated web pages.

SI-2 Flaw Remediation good match
prevent

Requires timely remediation of flaws through patching the vulnerable XStore Core plugin versions up to 5.6.4.

References