---
id: CVE-2026-19855
title: >-
  The CleanTalk WordPress plugin before 6.87 does not prevent unauthenticated,
  user-supplied comment content from being passed to WordPress's shortcode
  engine, allowing any visitor to have arbitrary shortcodes registered on the
  site execut…
summary: >-
  The CleanTalk WordPress plugin before 6.87 does not prevent unauthenticated,
  user-supplied comment content from being passed to WordPress's shortcode
  engine, allowing any visitor to have arbitrary shortcodes registered on the
  site execut…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-74
product: CleanTalk
affected:
  - CleanTalk < 6.87
published: '2026-09-09'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T16:17:02.250'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-19855'
references:
  - url: 'https://wpscan.com/vulnerability/c27f3657-261a-46cd-860c-0bdf5c849190/'
    label: contact@wpscan.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-09T15:22:26.851558Z'
epss: 0.00183
epssPercentile: 0.07008
ingestedAt: '2026-09-09T07:03:03.597Z'
---

## Overview

The CleanTalk WordPress plugin before 6.87 does not prevent unauthenticated, user-supplied comment content from being passed to WordPress's shortcode engine, allowing any visitor to have arbitrary shortcodes registered on the site executed server-side and rendered to every subsequent visitor of the page.

## Remediation

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