CVE-2026-76063 roxnor CVE debrief

Who should care

Defenders responsible for WordPress sites using the FundEngine plugin should assess exposure and prioritize updating the plugin to prevent exploitation. This includes verifying the plugin version, restricting access to the vulnerable REST endpoint, and monitoring for suspicious activity on the WordPress site.

Why it matters

The FundEngine plugin vulnerability allows authenticated attackers to inject arbitrary web scripts, which can lead to security breaches on WordPress sites. Defenders should prioritize verifying and updating the plugin to prevent exploitation.

• Authenticated attackers with subscriber-level access can inject arbitrary web scripts
• Injected scripts execute when a user accesses an injected page
• Defenders must verify and update the FundEngine plugin to prevent exploitation
• Exposure requires verification from official sources

Technical summary

The FundEngine – Donation and Crowdfunding Platform plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'wfp_featured_video_url' parameter in all versions up to, and including, 1.8.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Defensive priority

Defenders should prioritize verifying and updating the FundEngine plugin to prevent exploitation.

Recommended defensive actions

• Verify the FundEngine plugin version and update to a patched version if necessary
• Restrict access to the vulnerable REST endpoint
• Monitor for suspicious activity on the WordPress site
• 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 vulnerability allows authenticated attackers with subscriber-level access and above to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The FundEngine plugin's REST endpoint used to submit the video URL has its permission_callback set to __return_true, meaning any authenticated user — including those with Subscriber-level access — can reach the vulnerable code path. Defenders should verify and update the FundEngine plugin to prevent exploitation.

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.