CVE-2026-96752
Received Received - Intake

Stored XSS in Zero Spam WordPress Plugin via Contact Form 7

Publication date: 2026-09-25

Last updated on: 2026-09-25

Assigner: Wordfence

Description
The Zero Spam for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Nested POST Array Keys via Contact Form 7 Integration in all versions up to, and including, 5.7.10 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 payload is delivered by submitting a Contact Form 7 request with a nested POST array key containing arbitrary HTML or JavaScript — PHP parses the field name into a nested array key, which is stored verbatim in the zerospam_log.submission_data column when Zero Spam flags the submission as spam due to the absence of the zerospam_david_walsh_key field.

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Meta Information

Published
2026-09-25
Last Modified
2026-09-25
Generated
2026-09-25
AI Q&A
2026-09-25
EPSS Evaluated
N/A
NVD
CVE-2026-96752
EUVD
EUVD-2026-86589

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wpzerospam zero_spam to 5.7.10 (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

The Zero Spam for WordPress plugin has a stored cross-site scripting (XSS) vulnerability due to insufficient input sanitization and output escaping. Attackers can inject malicious scripts via Contact Form 7 requests using nested POST array keys. These scripts execute when users access infected pages.

Detection Guidance

This vulnerability involves stored XSS via Contact Form 7 integration in the Zero Spam WordPress plugin. Detection requires checking for suspicious submissions in the plugin's logs or database. Inspect the zerospam_log.submission_data column for entries containing arbitrary HTML or JavaScript payloads. Review server access logs for unusual POST requests to Contact Form 7 endpoints with nested array keys.

Impact Analysis

Unauthenticated attackers can inject arbitrary web scripts into pages. When users visit these pages, the malicious scripts execute, potentially stealing user data, session cookies, or performing actions on behalf of the user. This can lead to account compromise or further attacks.

Compliance Impact

This vulnerability could lead to data breaches, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Organizations may face fines, legal penalties, and reputational damage due to non-compliance with these regulations.

Mitigation Strategies

Immediately update the Zero Spam plugin to the latest version beyond 5.7.10. If an update is unavailable, disable the plugin temporarily. Review and sanitize all stored form submissions in the zerospam_log.submission_data column. Implement additional input validation for Contact Form 7 submissions to block nested array keys.

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