CVE-2026-94589 htplugins CVE debrief

Who should care

Defenders responsible for WordPress installations with the Extensions For CF7 plugin should assess exposure and prioritize remediation. This includes reviewing the plugin's version, restricting file uploads, and monitoring for suspicious activity. Additionally, defenders should verify the integrity of uploaded files and ensure that appropriate security controls are in place to mitigate the risk of remote code execution.

Why it matters

The Extensions For CF7 plugin vulnerability allows unauthenticated attackers to upload potentially executable files, making remote code execution possible. Defenders should prioritize verifying exposure and remediating vulnerable installations.

• Remote code execution is possible due to the arbitrary file upload vulnerability
• Unauthenticated attackers can upload potentially executable files
• Verification of exposure and remediation of vulnerable installations is necessary
• Monitoring for suspicious file uploads and system changes is recommended

Technical summary

The Extensions For CF7 plugin for WordPress is vulnerable to Arbitrary File Upload due to missing validation in the signature field and absence of PHP-execution guards in the upload directory. This allows unauthenticated attackers to upload potentially executable files, leading to remote code execution. The vulnerability exists in all versions up to, and including, 3.4.5 via the extcf7_submit function, and is exacerbated by a sanitize_file_name() bypass that converts shell.php- into shell.php. Defenders should prioritize verifying exposure and remediating vulnerable installations of the Extensions For CF7 plugin.

Defensive priority

Defenders should prioritize verifying exposure and remediating vulnerable installations of the Extensions For CF7 plugin.

Recommended defensive actions

• Verify the version of the Extensions For CF7 plugin and upgrade to a patched version if necessary
• Review and restrict file uploads to the plugin's upload directory
• Monitor for suspicious file uploads and system changes
• 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 the affected versions and the lack of validation in the signature field. Additional review of the Extensions For CF7 plugin and its handling of file uploads is recommended to understand the full scope of the vulnerability. Defenders should verify exposure and remediate vulnerable installations.

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.