CVE-2026-78416 HIGH

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

Vendor Craftcms

Product cms

Weakness CWE-915

Published August 24, 2026

Last update August 26, 2026

View on NVD All CVEs

CVSS base score

8.7/10

Attack vector Network

Attack complexity Low

Privileges required Low

User interaction None

Confidentiality —

Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

August 24, 2026 CVE published

August 26, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-78416 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/915.html AskarLabs — CWE-915 write-up Improperly Controlled Modification of Dynamically-Determined Object Attributes

Related vulnerabilities

Identifiers

CVE CVE-2026-78416

CWE CWE-915

CVSS 8.7 / HIGH

Affected versions

Vendor Craftcms

Product cms

Affected ≥ 4.0.0-RC1 and < 4.18.2

Vendor Craftcms

Product cms

Affected ≥ 5.0.0-RC1 and < 5.10.6

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

01Description

02Disclosure timeline

03References

04Related CVE