CVE-2026-1454
Published: 11 March 2026
Summary
CVE-2026-1454 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 Browser Session Hijacking (T1185); ranked at the 32.0th 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-2026-1454 is a stored cross-site scripting (XSS) vulnerability affecting the Responsive Contact Form Builder & Lead Generation Plugin for WordPress in all versions up to and including 2.0.1. The issue stems from insufficient input sanitization in the lfb_lead_sanitize() function, which omits certain field types from its sanitization whitelist, paired with an overly permissive wp_kses() filter during output that allows onclick attributes on anchor tags. This CWE-79 flaw has 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 this vulnerability by submitting malicious form fields containing arbitrary web scripts. When a site administrator views the resulting lead entries in the WordPress dashboard, the injected scripts execute in the administrator's browser context, potentially enabling theft of session cookies, keystroke logging, or other client-side attacks.
References to the vulnerability include code locations in the plugin's ajax-functions.php and show-lead.php files at version 2.0.1, a patch applied in WordPress plugin trac changeset 3462549, and details from Wordfence threat intelligence, which recommend updating the plugin beyond version 2.0.1 to mitigate the issue.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-11125
Vulnerability details
The Responsive Contact Form Builder & Lead Generation Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 2.0.1 via form field submissions. This is due to insufficient input sanitization in the lfb_lead_sanitize()…
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function which omits certain field types from its sanitization whitelist, combined with an overly permissive wp_kses() filter at output time that allows onclick attributes on anchor tags. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever an administrator views the lead entries in the WordPress dashboard.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stored XSS enables arbitrary JS execution in admin browser context, directly facilitating session hijacking, web portal input capture, and cookie theft.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation and sanitization of untrusted form-field inputs, which the vulnerable lfb_lead_sanitize() function failed to perform for omitted field types.
Requires filtering of information at output time, directly addressing the overly permissive wp_kses() configuration that allowed onclick attributes on anchor tags.
Mandates timely remediation of identified flaws, which in this case is achieved by updating the plugin beyond version 2.0.1 to eliminate the stored-XSS code paths.