CVE-2026-77993 Joomla Extension - joomlack.fr - Reflected XSS in Page Builder CK < 3.6.5
Attackers can execute arbitrary scripts in victim browsers via the iscontenttype parameter in the Page Builder CK extension for Joomla.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-77993?
CVE-2026-77993 is a medium-severity cross-site scripting vulnerability in joomlack.fr Page Builder CK extension for Joomla, published on 24 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Joomla Extension - joomlack.fr - Reflected XSS in Page Builder CK < 3.6.5 - The Joomla extension Page Builder CK is vulnerable to a reflected XSS via the iscontenttype parameter.
Weakness: CWE-79
Which versions are affected by CVE-2026-77993?
How do I fix CVE-2026-77993?
No fix has been published for CVE-2026-77993 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-77993 being exploited?
There is no known exploitation of CVE-2026-77993 in the wild and no public exploit code.
Sources
Also known as GHSA-vrrp-8526-8v58.