Vulnerability · Published Aug 24, 2026 · Assigned by Hackrate

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

High 8.7

In plain English

A high-severity security flaw in cms from craftcms. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities).

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)1.0%top 36.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
craftcms	cms	4.0.0-RC1 – before 4.18.25.0.0-RC1 – before 5.10.6

Weakness: CWE-915 · 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

References

https://www.hckrt.com/hacktivity/HCKRT-JD662P third-party-advisory, technical-description, mitigation
https://github.com/craftcms/cms/releases/tag/5.10.6 release-notes
https://github.com/craftcms/cms product