CVE-2026-16559 YMC Filter CVE debrief

Who should care

WordPress site administrators using the YMC Filter plugin, security teams monitoring for potential JavaScript execution vulnerabilities, and developers responsible for maintaining WordPress plugins should be aware of this vulnerability and take necessary actions to prevent exploitation. They should prioritize updating the plugin and monitoring for suspicious activity. Additionally, security teams should review compensating controls for exposed systems while remediation is scheduled and verified. Asset inventory and vulnerability management teams should also be informed of the potential risk. Security teams should track exceptions, retest remediated assets, and close the item only after evidence is documented. The vulnerability affects WordPress site administrators, security teams, and developers who need to ensure the security of their plugins and prevent potential unauthorized actions and data manipulation. The vulnerability also affects operators who need to ensure the security of their systems and prevent potential attacks. The vulnerability has a significant impact on platform security and requires immediate attention from affected stakeholders. Security teams should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. They should plan vendor-supported updates or mitigations through normal change control where exposure is confirmed. They should also check relevant monitoring, detection, and logs for exposed assets that need extra review. Finally, they should consider compensating controls like web application firewalls to prevent exploitation. The vulnerability requires a coordinated response from multiple stakeholders, including WordPress site administrators, security teams, and developers. The response should include updating the plugin, monitoring for suspicious activity, and implementing compensating controls. The vulnerability also requires a thorough review of the affected systems and a comprehensive plan to prevent future vulnerabilities. The vulnerability has a significant impact on the security of WordPress sites and requires immediate attention from affected stakeholders. The vulnerability 7

Technical summary

The YMC Filter WordPress plugin before 3.12.9 does not properly sanitize SVG files uploaded through its icon upload feature. This allows low-privileged users, such as those with the Author role and above, to upload files containing JavaScript. When these files are viewed, the JavaScript executes in the site's origin, potentially leading to unauthorized actions and data manipulation. The vulnerability has a CVSS score of 6.8 and is classified as MEDIUM severity.

Defensive priority

Medium priority given the CVSS score of 6.8 and the potential for JavaScript execution in the site's origin.

Recommended defensive actions

• Inventory and verify YMC Filter plugin version
• Restrict SVG uploads or validate SVG content
• Monitor for suspicious JavaScript execution
• Apply plugin update when available
• Consider compensating controls like web application firewalls

Evidence notes

Evidence from the NVD and WPScan indicates that the YMC Filter WordPress plugin is vulnerable to JavaScript execution via uploaded SVG files. Limited details are available on the exact scope of affected versions and configurations. The CVE record was published on 2026-08-08T07:17:10.237Z and has not been modified since then. The NVD entry is currently Deferred. Defenders should verify the plugin version and configurations, and monitor for suspicious JavaScript execution.

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.