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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Jsm Show Post Meta Plugin | — | Update jsm-show-post-meta plugin to version 4.9.1, or a newer patched version | Oct 30, 2026 | Sep 21, 2026 |
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