CVE-2026-77989 Joomla Extension - joomlaeventmanager.net - Reflected XSS via the PDF export link in Joomla Events Manager < 5.0.1
Reflected XSS in Joomla Events Manager allows attackers to execute arbitrary scripts via the PDF export link.
- 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-2026-77989?
CVE-2026-77989 is a medium-severity cross-site scripting vulnerability in joomlaeventmanager.net JEM - Joomla Event Manager extension for Joomla, published on 27 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 - joomlaeventmanager.net - Reflected XSS via the PDF export link in Joomla Events Manager < 5.0.1 - buildCurrentPdfLink copies the current request query string into the PDF button URL, and pdfbutton() echoes it unescaped, leading to an reflected XSS vector.
Weakness: CWE-79
Which versions are affected by CVE-2026-77989?
How do I fix CVE-2026-77989?
No fix has been published for CVE-2026-77989 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-2026-77989 being exploited?
There is no known exploitation of CVE-2026-77989 in the wild and no public exploit code.
Sources
Also known as GHSA-x373-x8fh-6pfh.