Cyber Resilience

CVE-2026-27352

High

Published: 05 March 2026

Published
05 March 2026
Modified
23 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-2026-27352 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-2026-27352 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, in the ThemeGoods Starto WordPress theme. This issue affects Starto versions from n/a through less than 2.2.5.

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 privileges required, and user interaction needed, with changed scope and low impacts to confidentiality, integrity, and availability. Remote attackers can exploit it by tricking authenticated users into interacting with maliciously crafted links or inputs reflected in web pages, potentially executing arbitrary scripts in the victim's browser context.

Mitigation details are available in the Patchstack advisory at https://patchstack.com/database/Wordpress/Theme/starto/vulnerability/wordpress-starto-theme-2-1-9-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve, which documents the vulnerability in the Starto theme.

EU & UK References

Vulnerability details

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeGoods Starto starto allows Reflected XSS.This issue affects Starto: from n/a through < 2.2.5.

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 →
T1059.007 JavaScript Execution
Adversaries may abuse various implementations of JavaScript for execution.
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 →
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 →
Why these techniques?

Reflected XSS in public-facing WordPress theme directly enables client-side JavaScript execution (T1059.007) via exploitation of the web application (T1190); this facilitates browser session hijacking (T1185) and theft of web session cookies (T1539) when victims click attacker-crafted links.

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

CVEs Like This One

CVE-2025-67949Shared CWE-79
CVE-2024-56033Shared CWE-79
CVE-2025-23549Shared CWE-79
CVE-2026-27072Shared CWE-79
CVE-2026-27068Shared CWE-79
CVE-2025-59542Shared CWE-79
CVE-2025-26989Shared CWE-79
CVE-2026-28103Shared CWE-79
CVE-2026-26266Shared CWE-79
CVE-2025-23838Shared 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, addressing the CWE-79 root cause in Starto.

SI-15 Information Output Filtering good match
prevent

Requires filtering or encoding of information sent to users, preventing reflected script execution in the victim's browser context.

SI-3 Malicious Code Protection partial match
preventdetect

Provides mechanisms to detect and block malicious code (scripts) delivered via crafted reflected inputs before execution.

References