CVE-2026-79988 Authenticated RCE through Twig sandbox escape
Authenticated attackers can execute arbitrary code by exploiting a Twig sandbox escape in Craft CMS that permits dangerous Yii framework functionality.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-79988?
CVE-2026-79988 is a high-severity code injection vulnerability in craftcms cms, published on 27 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Twig sandbox mechanism in Craft CMS is configured to allow dangerous functionality from the Yii framework, leading to authenticated RCE similar to previously disclosed vulnerabilities.
Weakness: CWE-693
Which versions are affected by CVE-2026-79988?
How do I fix CVE-2026-79988?
No fix has been published for CVE-2026-79988 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-2026-79988 being exploited?
There is no known exploitation of CVE-2026-79988 in the wild and no public exploit code.
Sources
Also known as GHSA-9fvq-jx89-q558.