CVE-2026-74253 Joomla Extension - regularlabs.com - Unauthenticated RCE through unverified reflected user input in Sourcerer < 16.0.0
Unauthenticated attackers can execute arbitrary code via reflected user input in the Sourcerer extension for Joomla.
- 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-2026-74253?
CVE-2026-74253 is a critical code injection vulnerability in regularlabs.com Sourcerer extension for Joomla, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Joomla Extension - regularlabs.com - Unauthenticated RCE through unverified reflected user input in Sourcerer < 16.0.0 - Regular Labs Sourcerer before 16.0.0 processes {source} blocks found in Joomla’s final rendered HTML without reliably determining where that code originated.
Weakness: CWE-94
Which versions are affected by CVE-2026-74253?
How do I fix CVE-2026-74253?
No fix has been published for CVE-2026-74253 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-2026-74253 being exploited?
There is no known exploitation of CVE-2026-74253 in the wild and no public exploit code.
Sources
Also known as GHSA-23wq-9cpv-vp32.