Remote Code Execution Vulnerability in Craft CMS by Yii Framework
CVE-2026-79988

8.7HIGH

Key Information:

Vendor

Craftcms

Status
Cms
Vendor
CVE Published:
27 August 2026

What is CVE-2026-79988?

A security vulnerability has been identified in Craft CMS due to the Twig sandbox configuration which inadvertently permits the execution of unsafe operations originating from the Yii framework, leading to authenticated remote code execution (RCE). This flaw poses significant risks to user data and application integrity, emphasizing the need for prompt remediation and adherence to secure coding practices.

Affected Version(s)

cms 4.0.0-RC1 < 4.18.3

cms 5.0.0-RC1 < 5.10.7

References

https://www.hckrt.com/hacktivity/HCKRT-8RQQ7K
third-party-advisorytechnical-descriptionmitigation
https://github.com/craftcms/cms/releases/tag/5.10.7
release-notes
https://github.com/craftcms/cms
product

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Oskar Zeino-Mahmalat (@oskar-cure53)
Hackrate
.