CVE-2025-15266

High

Published: 14 January 2026

Published

14 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 0.0024 46.6th percentile

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

Summary

CVE-2025-15266 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 46.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

This vulnerability is AI-related — categorised as LLM Application 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-2025-15266 is a stored cross-site scripting (XSS) vulnerability in the GeekyBot — Generate AI Content Without Prompt, Chatbot and Lead Generation plugin for WordPress, affecting all versions up to and including 1.1.8. The flaw stems from insufficient input sanitization and output escaping in the chat message field, allowing arbitrary web scripts to be injected and stored. It is rated 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) and is associated with CWE-79 (Cross-Site Scripting).

Unauthenticated attackers can exploit this vulnerability over the network with low complexity and no user interaction required. By submitting a malicious payload via the chat message field, attackers can inject scripts that persist in the database and execute in an administrator's browser context whenever the Chat History page is accessed, potentially leading to session hijacking, data theft, or further site compromise due to the changed scope.

Mitigation guidance from advisories, including those from Wordfence and the WordPress plugin trac repository, points to updating the GeekyBot plugin to a patched version beyond 1.1.8, as evidenced by the relevant changeset in the plugin's development log. Security practitioners should scan WordPress sites using this plugin and apply updates promptly via the official plugin directory.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-2551

Vulnerability details

The GeekyBot — Generate AI Content Without Prompt, Chatbot and Lead Generation plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the chat message field in all versions up to, and including, 1.1.8 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 an administrator accesses the Chat History page.

CWE(s): CWE-79

AI Security AnalysisAI

AI Category: LLM Application Platforms
Risk Domain: Other ATLAS/OWASP Terms
OWASP Top 10 for LLMs 2025: None mapped
Classification Reason: Matched keywords: ai

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 in public-facing WordPress plugin directly enables T1190 (Exploit Public-Facing Application) for unauthenticated injection; execution in admin browser context facilitates T1185 (Browser Session Hijacking) leading to session theft or further compromise.

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