CVE-2025-14436

High

Published: 08 January 2026

Published

08 January 2026

Modified

15 April 2026

KEV Added

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Patch

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CVSS Score v3.1 7.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

EPSS Score 0.0017 37.7th percentile

Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-14436 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 37.7th 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-2025-14436 is a stored cross-site scripting (XSS) vulnerability in the Brevo for WooCommerce plugin for WordPress, affecting all versions up to and including 4.0.49. The flaw arises from insufficient input sanitization and output escaping of the 'user_connection_id' parameter, enabling the injection of arbitrary web scripts into pages. Published on 2026-01-08, it carries 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) and is associated with CWE-79.

Unauthenticated attackers can exploit this vulnerability remotely with low attack complexity and no privileges or user interaction required. By submitting a malicious payload via the 'user_connection_id' parameter, they can store scripts on affected pages, which then execute in the browser context of any user who accesses those pages, potentially compromising session data or performing actions on behalf of victims.

References provided link to the WordPress plugin trac repository for the woocommerce-sendinblue-newsletter-subscription codebase, highlighting vulnerable code paths in files such as src/managers/admin-manager.php (line 59), src/views/admin_menus.php (line 728), and woocommerce-sendinblue.php (lines 164, 171, and 188). No specific patch or mitigation details are detailed in the available information.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2025-206266

Vulnerability details

The Brevo for WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘user_connection_id’ parameter in all versions up to, and including, 4.0.49 due to insufficient input sanitization 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): 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 →

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?

Stored XSS enables remote exploitation of public-facing web app (T1190) and direct browser session hijacking via injected scripts compromising session data.

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