CVE-2026-19855 PUBLISHED

Spam protection, Honeypot, Anti-Spam by CleanTalk < 6.87 - Unauthenticated Arbitrary Shortcode Execution via Comment Text

Assigner: WPScan
Reserved: 14.08.2026 Published: 09.09.2026 Updated: 09.09.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS Score: 6.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	Low
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Unknown
Product	CleanTalk
Versions	Default: unaffected affected from 0 to 6.87 (excl.)

Credits

Jakub Herman finder
WPScan coordinator

References

https://wpscan.com/vulnerability/c27f3657-261a-46cd-860c-0bdf5c849190/

Problem Types

CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') CWE