RCE Vulnerabilities in Craft CMS Versions 4.0.0 and 5.0.0

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RCE Vulnerabilities in Craft CMS Versions 4.0.0 and 5.0.0

First seen 13 Oct 2026, 16:34 UTC •70.5

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ThreatCluster •October 13, 2026 at 17:33 UTC

•Craft CMS versions 4.0.0 and 5.0.0 are vulnerable to critical RCE flaws.
•Attackers could exploit these vulnerabilities via actionCacheUpdates and Twig sandbox bypass.
•Users should upgrade to the latest versions immediately to mitigate risks.

Craft CMS versions 4.0.0 before 4.18.7 and 5.0.0 before 5.10.14 are affected by remote code execution (RCE) vulnerabilities. The vulnerabilities arise from improper control of code generation, specifically via actionCacheUpdates behavior injection and a Twig sandbox bypass. These flaws could allow attackers to execute arbitrary code on affected systems. Users are urged to upgrade to the latest versions to mitigate these risks. The vulnerabilities have been assigned CVE identifiers, with the first article detailing the RCE via actionCacheUpdates and the second addressing the Twig sandbox bypass. As of now, there are no reports of in the wild, but the potential for exploitation remains high. Security teams should prioritize patching to protect their installations.

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Timeline

2026-10-13

Vulnerabilities disclosed

Craft CMS vulnerabilities affecting versions 4.0.0 and 5.0.0 were disclosed, allowing RCE via specific methods.

2026-10-13

Patch released

Craft CMS released updates to address the critical RCE vulnerabilities in affected versions.

More articles in this cluster (2)

Threat Graph

4 entities, 3 inferred relationships (STIX 2.1).

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Technique (1)

Zero-day Exploit

Weakness (1)

CWE-94 - Code Injection

Affected Platform (1)

Craft CMS

Vulnerability (1)

Twig Sandbox Bypass

Relationships

Twig Sandbox Bypass targets Craft CMS
Zero-day Exploit targets Craft CMS
Twig Sandbox Bypass related to CWE-94 - Code Injection

Common questions

Which versions are affected?

Craft CMS versions 4.0.0 before 4.18.7 and 5.0.0 before 5.10.14 are affected.

Is there active exploitation of these vulnerabilities?

No confirmed active exploitation has been reported as of now.

What should I do to protect my systems?

Upgrade to the latest versions of Craft CMS to mitigate the vulnerabilities.

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