CVE-2026-87796 sh1zen CVE debrief

Who should care

Defenders responsible for WordPress sites using the Multi Uploader for Gravity Forms plugin should assess exposure and prioritize updating the plugin to prevent arbitrary file uploads and potential remote code execution.

Why it matters

CVE-2026-87796 is a critical vulnerability in the Multi Uploader for Gravity Forms plugin for WordPress, allowing unauthenticated attackers to upload arbitrary files, potentially leading to remote code execution. Defenders should prioritize verifying and updating the plugin to prevent exploitation.

• Unauthenticated attackers may upload arbitrary files on the affected site's server
• Uploaded files may lead to remote code execution
• Defenders must verify and update the plugin to prevent exploitation
• Server logs should be reviewed for suspicious file upload activity

Technical summary

The Multi Uploader for Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.1.9 via the move_file function. This is due to insufficient file type validation during chunked upload handling, which allows unauthenticated attackers to upload arbitrary files on the affected site's server, potentially leading to remote code execution. The vulnerability is caused by a lack of proper validation of file types during the upload process, making it possible for attackers to bypass security measures and upload malicious files. To exploit this vulnerability, an attacker would need to send a crafted request to the affected site's server, potentially allowing them to

Defensive priority

Defenders should prioritize verifying and updating the Multi Uploader for Gravity Forms plugin to prevent arbitrary file uploads and potential remote code execution.

Recommended defensive actions

• Verify the Multi Uploader for Gravity Forms plugin version and update to a patched version if necessary
• Review server logs for suspicious file upload activity
• Implement additional security measures to monitor and restrict file uploads
• Conduct a thorough review of the affected site's server for any suspicious activity or uploaded files
• Consider implementing a web application firewall to detect and prevent suspicious file uploads
• Review and update incident response plans to include procedures for handling potential remote code execution attacks
• Perform a thorough vulnerability assessment of the affected site's server to identify any potential entry points for attackers

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including the affected plugin and versions. However, the corpus does not establish versions, exploitation, impact, or remediation beyond the provided information.

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.