CVE-2026-112773 craftcms CVE debrief

Who should care

Defenders responsible for Craft CMS installations, particularly those with authenticated Control Panel users, should assess exposure and apply patches or updates to prevent potential code execution.

Why it matters

CVE-2026-112773 is a high-severity vulnerability in Craft CMS that allows authenticated users to execute code, potentially leading to data breaches, system compromise, and reputational damage. Defenders should prioritize verifying exposure and applying patches.

• Code execution as the web user
• Potential for lateral movement
• Data tampering or theft by authenticated users
• Reputation damage from successful exploitation

Technical summary

The vulnerability allows authenticated Control Panel users to inject malicious event handlers via uncleansed criteria to achieve code execution as the web user. This is possible due to a flaw in the Twig sandbox behavior in Craft CMS versions 5.0.0 before 5.11.0. The vulnerability can be exploited by passing uncleansed criteria to getNext, getPrev, or getOwners, allowing attackers to inject Yii 'as' or 'on' config keys to attach malicious event handlers that execute when the element query runs. Defenders should prioritize verifying exposure and applying patches, as authenticated users can exploit this vulnerability to execute code.

Defensive priority

Defenders should prioritize verifying exposure and applying patches, as authenticated users can exploit this vulnerability to execute code.

Recommended defensive actions

• Verify exposure by checking Craft CMS versions and user access
• Apply patches or updates to version 5.11.0 or later
• Monitor for suspicious activity from authenticated users
• Restrict Control Panel access to trusted users and networks
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and source item provide details on the vulnerability, affected versions, and references to vendor advisories. The vulnerability is caused by a flaw in the Twig sandbox behavior in Craft CMS versions 5.0.0 before 5.11.0. The CVE Program record and NIST NVD detail page provide official information on the vulnerability. Vendor advisories and third-party advisories also provide additional information on the vulnerability and affected versions.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.