Cyber Resilience

CVE-2026-27375

High

Published: 05 March 2026

Published
05 March 2026
Modified
22 April 2026
KEV Added
—
Patch
—
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-2026-27375 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 Drive-by Compromise (T1189); 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-2026-27375 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, in the JanStudio Gecko WordPress theme. This issue affects Gecko theme versions from n/a through 1.9.8 inclusive. The vulnerability was published on 2026-03-05 and 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).

The vulnerability can be exploited by remote attackers requiring no privileges over the network with low attack complexity, though user interaction is necessary. Exploitation enables reflected XSS, allowing attackers to inject and execute arbitrary scripts in the context of a victim's browser when the user is tricked into interacting with a maliciously crafted request, such as clicking a link.

Mitigation guidance is provided in the Patchstack advisory at https://patchstack.com/database/Wordpress/Theme/gecko/vulnerability/wordpress-gecko-theme-1-9-8-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 JanStudio Gecko gecko allows Reflected XSS.This issue affects Gecko: from n/a through <= 1.9.8.

CWE(s)
CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1189 Drive-by Compromise Initial Access
Adversaries may gain access to a system through a user visiting a website over the normal course of browsing.
attack.mitre.org →
T1204.001 Malicious Link Execution
An adversary may rely upon a user clicking a malicious link in order to gain execution.
attack.mitre.org →
Why these techniques?

Reflected XSS in public-facing WordPress theme directly enables arbitrary browser script execution when a victim is tricked into clicking a crafted URL (T1204.001) or visits the vulnerable site in a drive-by scenario (T1189).

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

CVEs Like This One

CVE-2026-32494Shared CWE-79
CVE-2026-27353Shared CWE-79
CVE-2025-22793Shared CWE-79
CVE-2026-25304Shared CWE-79
CVE-2026-25351Shared CWE-79
CVE-2026-28113Shared CWE-79
CVE-2025-67964Shared CWE-79
CVE-2026-24752Shared CWE-79
CVE-2025-25108Shared CWE-79
CVE-2025-23652Shared CWE-79

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly requires validation of untrusted input before it is used in web page generation, preventing the reflected XSS payload from being executed.

SI-15 Information Output Filtering good match
prevent

Requires filtering or encoding of information output to browsers, neutralizing script content injected via the reflected XSS vector in the Gecko theme.

AC-4 Information Flow Enforcement partial match
prevent

Enforces information flow rules that can block untrusted data containing scripts from being rendered in user browser contexts.

References