CVE-2026-72781 Craft CMS 5.0.0-RC1 before 5.10.7 Remote Code Execution via Twig Sandbox Escape
Authenticated attackers can execute arbitrary code via Twig sandbox escape in Craft CMS, requiring an upgrade to patched versions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72781?
CVE-2026-72781 is a high-severity code injection vulnerability in craftcms cms, published on 11 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Craft CMS versions >= 5.0.0-RC1 before 5.10.7 and >= 4.0.0-RC1 before 4.18.3 contain a remote code execution vulnerability in the Twig sandbox mechanism. Because Craft marks the ElementInterface as safe (via the AllowedInSandbox attribute) and the sandbox allowlisting extends to the entire class hierarchy (craft\base\Component up to yii\base\Component), an authenticated attacker with permission to access the control panel can render a malicious Twig template that abuses the yii\base\Component arbitrary function-call gadget to execute arbitrary code, even when the Twig sandbox is enabled via enableTwigSandbox().
Weakness: CWE-693
Which versions are affected by CVE-2026-72781?
4 open source packages ship an affected version, including craftcms/cms.
| Package | Affected | Fixed in |
|---|---|---|
craftcms/cms Packagist | From 4.0.0-RC1 | 4.18.3 |
craftcms/cms Packagist | From 4.0.0-RC1 | 4.18.3 |
craftcms/cms Packagist | From 5.0.0-RC1 | 5.10.7 |
craftcms/cms Packagist | From 5.0.0-RC1 | 5.10.7 |
How do I fix CVE-2026-72781?
Upgrade craftcms/cms to a fixed version for your release line: 4.18.3 or 5.10.7.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-72781 being exploited?
There is no known exploitation of CVE-2026-72781 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-f5wm-88jv-g5hx.