CVE-2026-88997: Unknown Jsm Show Post Metadata

Medium severity, CVSS 6.8. EPSS: 0.3% chance of exploitation in the next 30 days.

The JSM Show Post Metadata WordPress plugin before 4.9.1 does not properly escape a post meta key before outputting it into an inline event-handler attribute in an admin-facing meta box, allowing users with contributor-level access and above to inject arbitrary JavaScript that executes in the session of a higher-privileged user who reviews the affected post.

Affected products

• Unknown Jsm Show Post Metadata: before 4.9.1 (fixed in 4.9.1)

Published 2026-09-23. Last modified 2026-09-23.