Vulnerability · Published Sep 23, 2026 · Assigned by WPScan

CVE-2026-88997JSM Show Post Metadata < 4.9.1 - Contributor+ Stored XSS via Custom Field Meta Key

Medium 6.8

In plain English

A medium-severity cross-site scripting in JSM Show Post Metadata from Unknown. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)6.8Medium

Exploit odds (30 days)0.4%top 62.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack tooling1Public PoC

Official description

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 (as reported)

Vendor	Product	Versions
Unknown	JSM Show Post Metadata	0 – before 4.9.1

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H

References

https://wpscan.com/vulnerability/1699d3aa-29ca-4197-8e3b-0b03ecce751a/ exploit, vdb-entry, technical-description