CVE-2026-19855: CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in CleanTalk
Description
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.
CVSS v3.1
6.5medium
Affected software
CleanTalk
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The CleanTalk WordPress plugin versions prior to 6.87 do not properly neutralize special elements in user-supplied comment content before passing it to WordPress's shortcode engine. This improper neutralization (CWE-74) allows any visitor to register arbitrary shortcodes that are executed on the server side and displayed to subsequent visitors, potentially leading to information disclosure or other impacts related to shortcode execution.
Potential Impact
An unauthenticated attacker can inject arbitrary shortcodes via comment content, causing those shortcodes to be executed server-side and rendered to all visitors of the affected page. This can lead to limited confidentiality and integrity impacts as indicated by the CVSS vector (C:L/I:L/A:N). There is no indication of availability impact or known active exploitation in the wild.
Mitigation Recommendations
No official fix or patch is currently confirmed. Users should monitor the vendor advisory for updates and apply version 6.87 or later once available. Until then, consider restricting or sanitizing comment content to prevent shortcode injection if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 08/14/2026
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aa0fec2acd9273b49e19aa1
Added to database: 09/09/2026, 06:37:54 UTC
Last enriched: 09/09/2026, 06:53:17 UTC
Last updated: 10/24/2026, 08:45:10 UTC
Views: 81
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