---
id: CVE-2026-88997
title: >-
  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 a…
summary: >-
  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 a…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-79
product: JSM Show Post Metadata
affected:
  - jsm_show_post_metadata < 4.9.1
published: '2026-09-23'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T18:12:32.050'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88997'
references:
  - url: 'https://wpscan.com/vulnerability/1699d3aa-29ca-4197-8e3b-0b03ecce751a/'
    label: contact@wpscan.com
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00293
epssPercentile: 0.19398
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-23T10:38:22.858441Z'
ingestedAt: '2026-09-23T06:17:57.897Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/pervinzahidli/CVE-2026-88997'
  checkedAt: '2026-09-25T08:21:20.932Z'
exploitAvailable: true
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.