CVE-2026-19855 Code injection in CleanTalk
Unauthenticated attackers can execute arbitrary shortcodes via comment text, leading to server-side code execution and content modification.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19855?
CVE-2026-19855 is a medium-severity code injection vulnerability in Unknown CleanTalk, published on 9 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-74
Which versions are affected by CVE-2026-19855?
How do I fix CVE-2026-19855?
No fix has been published for CVE-2026-19855 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-19855 being exploited?
There is no known exploitation of CVE-2026-19855 in the wild and no public exploit code.
Sources
Also known as GHSA-5543-49w7-m8jw.