What’s Vulnerable › Vulnerabilities

CVE-2026-79988: Authenticated RCE through Twig sandbox escape

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-27 · updated 2026-08-28
• Weakness: CWE-693

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.

Affected products

• craftcms cms: from 4.0.0-RC1 before 4.18.3; from 5.0.0-RC1 before 5.10.7 — fixed in 4.18.3, 5.10.7

How to fix

Upgrade to a fixed version: craftcms cms 4.18.3, 5.10.7. Check the vendor advisory for mitigations.

References

• https://github.com/craftcms/cms
• https://github.com/craftcms/cms/releases/tag/5.10.7
• https://www.hckrt.com/hacktivity/HCKRT-8RQQ7K

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