CVE-2026-86801 To Do List Member CVE debrief

Who should care

Defenders responsible for WordPress installations using the To Do List Member plugin should assess exposure and prioritize remediation. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify and remediate this vulnerability in their WordPress installations.

Why it matters

CVE-2026-86801 is a high-severity vulnerability in the To Do List Member WordPress plugin that allows unauthenticated file uploads, enabling attackers to execute malicious content and potentially serve it from the site's origin. Defenders should prioritize verifying and remediating this vulnerability in their WordPress installations.

• Unauthenticated file upload allows active content execution
• Potential for malicious content serving from the site's origin
• Possible unauthorized file listing and deletion

Technical summary

The To Do List Member WordPress plugin from 1.4 through 1.6 has a file upload endpoint that does not load WordPress and therefore applies no authentication, capability or nonce check of any kind, and validates only the name of an uploaded file rather than its content, allowing unauthenticated users to store active content served from the site's own origin, and to list and delete the files already staged there.

Defensive priority

Defenders should prioritize verifying and remediating this vulnerability in their WordPress installations.

Recommended defensive actions

• Verify and remediate vulnerable To Do List Member WordPress plugin installations
• Implement authentication and validation checks for file uploads
• Monitor for suspicious file upload activity
• 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 To Do List Member WordPress plugin from 1.4 through 1.6 has a file upload endpoint that does not apply authentication, capability, or nonce checks, and only validates the name of an uploaded file. This allows unauthenticated users to store active content served from the site's own origin and list and delete staged files.

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.