CVE-2026-103424 cleantalk CVE debrief

Who should care

Defenders responsible for WordPress installations using the Anti-Spam by CleanTalk plugin, particularly those with version 6.88 or earlier, should assess exposure and prioritize verification and potential remediation.

Why it matters

The Anti-Spam by CleanTalk plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 6.88. Defenders should prioritize verifying the presence of vulnerable versions and assess exposure to unauthenticated Stored Cross-Site Scripting attacks.

• Defenders should verify the presence of version 6.88 or earlier of the Anti-Spam by CleanTalk plugin in their WordPress installations.
• Unauthenticated Stored Cross-Site Scripting attacks may be possible against WordPress installations with vulnerable versions of the plugin.
• Defenders should implement additional security measures to detect and prevent Stored Cross-Site Scripting attacks.
• Remediation priority is moderate due to the medium CVSS score and limited information on potential exploits.

Technical summary

The Anti-Spam by CleanTalk plugin for WordPress, version 6.88 or earlier, is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter. This is due to insufficient input sanitization and output escaping, allowing unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The vulnerability has a medium CVSS score of 5.4, indicating moderate severity. Defenders should prioritize verifying the presence of version 6.88 or earlier of the Anti-Spam by CleanTalk plugin in their WordPress installations and assess exposure to unauthenticated Stored Cross-Site Scripting attacks. The CVE record and source item provide details on the  

Defensive priority

Defenders should prioritize verifying the presence of version 6.88 or earlier of the Anti-Spam by CleanTalk plugin in their WordPress installations and assess exposure to unauthenticated Stored Cross-Site Scripting attacks.

Recommended defensive actions

• Verify the version of the Anti-Spam by CleanTalk plugin in use and update to a patched version if necessary
• Implement additional security measures to detect and prevent Stored Cross-Site Scripting attacks
• Monitor WordPress installations for potential exploitation of this vulnerability
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description, CVSS score, and affected versions. However, there is limited information on potential exploits or attacks.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.