CVE-2026-77263
Received Received - Intake

Stored XSS in iubenda WordPress Plugin via Comment Content

Publication date: 2026-09-05

Last updated on: 2026-09-05

Assigner: Wordfence

Description
The iubenda | All-in-one Compliance for GDPR / CCPA Cookie Consent + more plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Comment Content in all versions up to, and including, 3.13.4 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. The exploit works by embedding KSES-allowed markup such as abbr title attributes and HTML comments in a submitted comment so that the global strtr() substitution strips substrings from an inert tag, mutating it into an executable element such as an img onerror handler that runs in the WordPress origin for any visitor, including logged-in administrators.

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Meta Information

Published
2026-09-05
Last Modified
2026-09-05
Generated
2026-09-05
AI Q&A
2026-09-05
EPSS Evaluated
N/A
NVD
CVE-2026-77263
EUVD
EUVD-2026-71844

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
iubenda all-in-one_compliance_for_gdpr_ccpa_cookie_consent to 3.13.4 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the iubenda WordPress plugin. It allows unauthenticated attackers to inject malicious scripts into comment content due to poor input sanitization and output escaping. The attack abuses KSES-allowed markup like HTML comments or attributes to transform harmless tags into executable elements, such as img onerror handlers, which run in the WordPress environment for any visitor, including administrators.

Detection Guidance

Check WordPress comment logs for suspicious entries containing HTML tags like img onerror or abbr title attributes. Use grep to scan comment content in the database or files for patterns like 'onerror=' or 'title=' in comments.

Impact Analysis

An attacker could exploit this to steal user sessions, perform actions on behalf of users, or deface websites. Visitors to infected pages may have their data compromised, and administrators could unknowingly execute malicious scripts while managing the site.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR and HIPAA requirements for data protection and integrity. Organizations using the vulnerable plugin may face compliance breaches, legal penalties, and reputational damage due to compromised user data.

Mitigation Strategies

Update the iubenda plugin to the latest version beyond 3.13.4. Temporarily disable comment functionality if updates are not immediately available. Review and sanitize existing comments for malicious scripts.

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