Medium severity · published Sep 9, 2026
CVE-2026-19855
Spam protection, Honeypot, Anti-Spam by CleanTalk < 6.87 - Unauthenticated Arbitrary Shortcode Execution via Comment Text
6.5
CVSS
0.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CL
CleanTalk ·
before 6.87 · source: vendor