CVE-2026-27068
Published: 19 March 2026
Summary
CVE-2026-27068 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.
This vulnerability is AI-related — categorised as Other Platforms; in the Other ATLAS/OWASP Terms risk domain.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering).
Deeper analysis
CVE-2026-27068 is an Improper Neutralization of Input During Web Page Generation vulnerability, enabling Reflected Cross-Site Scripting (XSS) as classified under CWE-79. It affects the Website LLMs.txt WordPress plugin (website-llms-txt), developed by Ryan Howard, in all versions from n/a through 8.2.6. The flaw allows malicious input to be reflected in web page generation without proper sanitization.
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, but user interaction needed, with changed scope and low impacts on confidentiality, integrity, and availability. Remote attackers can exploit it by tricking authenticated users—such as site visitors or administrators—into interacting with a crafted link or input containing a malicious payload. Successful exploitation executes arbitrary JavaScript in the victim's browser context, potentially leading to session hijacking, data theft, or further client-side compromise.
Mitigation details are outlined in the Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/website-llms-txt/vulnerability/wordpress-website-llms-txt-plugin-8-2-6-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve, which covers the WordPress plugin vulnerability in version 8.2.6. Security practitioners should check for plugin updates beyond 8.2.6 and apply input validation or content security policies as interim measures.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-13089
Vulnerability details
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Ryan Howard Website LLMs.txt website-llms-txt allows Reflected XSS.This issue affects Website LLMs.txt: from n/a through <= 8.2.6.
- CWE(s)
AI Security AnalysisAI
- AI Category
- Other Platforms
- Risk Domain
- Other ATLAS/OWASP Terms
- OWASP Top 10 for LLMs 2025
- None mapped
- Classification Reason
- Matched keywords: llms
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Reflected XSS in public-facing WordPress plugin directly enables T1190 (exploit of public app via crafted input/link). Payload execution runs arbitrary JS (T1059.007). Explicit impacts include browser session hijacking (T1185) and web session cookie theft (T1539).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
SI-15 directly addresses improper neutralization of input during web page generation by requiring output filtering to prevent reflected XSS payloads from executing in users' browsers.
SI-10 enforces validation of untrusted inputs from crafted links or forms, blocking malicious JavaScript payloads before they can be reflected in web pages.
SI-2 mandates timely flaw remediation, such as updating the vulnerable website-llms-txt WordPress plugin beyond version 8.2.6 to fix the XSS vulnerability.