What’s Vulnerable › Vulnerabilities

CVE-2026-78416: Authenticated RCE via `condition.config` JSON cleanse bypass

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-24 · updated 2026-10-12
• Weakness: CWE-915

Description

Craft CMS versions from 4.0.0-RC1 before 4.18.2 and from 5.0.0-RC1 before 5.10.6 contain an authenticated remote code execution vulnerability in control panel element-search condition handling. A JSON cleanse bypass in condition.config allows Yii behavior/event configuration keys to be interpreted after decoding, enabling command execution as the PHP/web user.

Affected products

• craftcms cms: from 4.0.0-RC1 before 4.18.2; from 5.0.0-RC1 before 5.10.6 — fixed in 4.18.2, 5.10.6

How to fix

Upgrade to a fixed version: craftcms cms 4.18.2, 5.10.6. Check the vendor advisory for mitigations.

References

• https://github.com/craftcms/cms
• https://github.com/craftcms/cms/releases/tag/5.10.6
• https://www.hckrt.com/hacktivity/HCKRT-JD662P

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