CVE-2026-96752: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in bmarshall511 Zero Spam for WordPress
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.
AI Analysis
Technical Summary
CVE-2026-96752 is a stored cross-site scripting vulnerability in the Zero Spam for WordPress plugin (versions <=5.7.10). It occurs due to improper neutralization of input during web page generation (CWE-79). Attackers can submit a Contact Form 7 request with nested POST array keys containing malicious HTML or JavaScript. PHP parses these keys into nested arrays, which are stored verbatim in the zerospam_log.submission_data database column when the submission is flagged as spam. This allows execution of arbitrary scripts in the context of users viewing the injected pages.
Potential Impact
An unauthenticated attacker can inject persistent malicious scripts into pages viewed by other users, potentially leading to theft of user credentials, session hijacking, or other client-side attacks. The CVSS score of 7.2 reflects high severity with network attack vector, low complexity, no privileges required, no user interaction, and impact on confidentiality and integrity but not availability.
Mitigation Recommendations
No official patch or fix is currently documented for this vulnerability. Users should monitor the vendor's advisory channels for updates. Until a fix is available, consider disabling Contact Form 7 integration or the Zero Spam plugin to prevent exploitation. Implementing web application firewall (WAF) rules to detect and block nested POST array keys with suspicious content may provide temporary mitigation.
CVE-2026-96752: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in bmarshall511 Zero Spam for WordPress
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.
CVSS v3.1
Score 7.2high
Affected software
bmarshall511
Zero Spam for WordPress
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-96752 is a stored cross-site scripting vulnerability in the Zero Spam for WordPress plugin (versions <=5.7.10). It occurs due to improper neutralization of input during web page generation (CWE-79). Attackers can submit a Contact Form 7 request with nested POST array keys containing malicious HTML or JavaScript. PHP parses these keys into nested arrays, which are stored verbatim in the zerospam_log.submission_data database column when the submission is flagged as spam. This allows execution of arbitrary scripts in the context of users viewing the injected pages.
Potential Impact
An unauthenticated attacker can inject persistent malicious scripts into pages viewed by other users, potentially leading to theft of user credentials, session hijacking, or other client-side attacks. The CVSS score of 7.2 reflects high severity with network attack vector, low complexity, no privileges required, no user interaction, and impact on confidentiality and integrity but not availability.
Mitigation Recommendations
No official patch or fix is currently documented for this vulnerability. Users should monitor the vendor's advisory channels for updates. Until a fix is available, consider disabling Contact Form 7 integration or the Zero Spam plugin to prevent exploitation. Implementing web application firewall (WAF) rules to detect and block nested POST array keys with suspicious content may provide temporary mitigation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-09-23T15:55:47.361Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab62748f7a7c541068154df
Added to database: 09/25/2026, 07:48:24 UTC
Last enriched: 09/25/2026, 08:02:39 UTC
Last updated: 09/26/2026, 03:39:54 UTC
Views: 21
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