CVE-2026-0800
Published: 24 January 2026
Summary
CVE-2026-0800 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Wordpress (inferred from references). Its CVSS base score is 7.2 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 43.8th 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-2026-0800 is a stored cross-site scripting (XSS) vulnerability, classified under CWE-79, in the User Submitted Posts – Enable Users to Submit Posts from the Front End plugin for WordPress. It affects all versions up to and including 20251210 due to insufficient input sanitization and output escaping of custom fields. This flaw enables the injection of arbitrary web scripts into pages, with a CVSS v3.1 base score of 7.2 (AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N).
Unauthenticated attackers can exploit the vulnerability by submitting posts containing malicious scripts via custom fields. The injected scripts are stored persistently and execute in users' browsers whenever they access the affected pages, potentially leading to session hijacking, defacement, or theft of sensitive data from authenticated users.
Mitigation is addressed in the plugin patch at https://plugins.trac.wordpress.org/changeset/3436859/user-submitted-posts. Security practitioners should update to a version beyond 20251210 and review the Wordfence threat intelligence details at https://www.wordfence.com/threat-intel/vulnerabilities/id/1ec907bc-bd10-4dc5-be35-4f2aaf5ef444?source=cve for additional remediation guidance.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-4549
Vulnerability details
The User Submitted Posts – Enable Users to Submit Posts from the Front End plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the custom fields in all versions up to, and including, 20251210 due to insufficient input sanitization…
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and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stored XSS in public-facing WordPress plugin directly enables exploitation of a web application (T1190) via unauthenticated script injection leading to client-side execution and impacts like session hijacking.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation of all inputs (including custom fields from unauthenticated users) to reject or sanitize malicious scripts before storage.
Requires filtering/encoding of all outputs so that stored scripts cannot execute in browsers when pages are rendered.
Enforces information flow rules that can block untrusted user-supplied content containing scripts from being persisted and later displayed to other users.