CVE-2026-27367
Published: 05 March 2026
Summary
CVE-2026-27367 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-2026-27367 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, in the Musico theme developed by ThemeGoods for WordPress. The issue affects Musico versions from n/a through those prior to 3.4.5.
With 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 is exploitable remotely over the network by unauthenticated attackers with low complexity, though it requires user interaction such as visiting a malicious link. Exploitation changes the security scope, enabling limited impacts on confidentiality, integrity, and availability, such as executing scripts in the victim's browser context to potentially steal session data or perform minor manipulations.
The Patchstack advisory at https://patchstack.com/database/Wordpress/Theme/musico/vulnerability/wordpress-musico-theme-3-2-4-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve details the Reflected XSS in the WordPress Musico theme, confirming affected versions and recommending updates to mitigate the issue, aligning with the fix introduced in Musico 3.4.5 and later.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-9626
Vulnerability details
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeGoods Musico musico allows Reflected XSS.This issue affects Musico: from n/a through < 3.4.5.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Reflected XSS in public-facing WordPress theme directly enables exploitation of web application (T1190) via malicious links (T1566.002) and facilitates browser session hijacking through script execution to steal session data (T1185).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Requires validation and neutralization of untrusted input before it is used in web page generation, directly blocking the reflected XSS payload in Musico.
Mandates output filtering/encoding of data written to web responses, preventing execution of attacker-supplied scripts in the victim's browser context.
Requires timely remediation of known flaws, ensuring the Musico theme is updated to version 3.4.5+ where the reflected XSS is fixed.