CVE-2026-92593 craftcms CVE debrief

Who should care

Defenders responsible for Craft CMS installations, particularly those with low-privilege control panel users, should assess exposure and prioritize upgrading to version 5.10.13 or later to prevent server-side template injection attacks.

Why it matters

CVE-2026-92593 is a high-severity vulnerability in Craft CMS that allows authenticated low-privilege users to execute arbitrary PHP code, potentially leading to full server compromise. Defenders should prioritize upgrading to version 5.10.13 or later and monitor low-privilege user activity.

• Potential execution of arbitrary PHP code on the server
• Possible full server compromise
• Required verification of affected versions and user privileges
• Need for prompt remediation through version upgrade

Technical summary

The vulnerability exists in Craft CMS versions 5.10.0 through 5.10.12 due to an incomplete fix for CVE-2026-55794. An authenticated low-privilege control panel user can mint a token over attacker-controlled Twig for the returnUrl parameter and replay it as the redirect POST parameter, reaching the unsandboxed sink and achieving server-side template injection that executes arbitrary PHP code. This occurs because Craft/Yii HMAC tokens are not bound to a parameter name, allowing for token replay attacks. The issue is addressed in version 5.10.13, which properly mitigates the vulnerability.

Defensive priority

Defenders should prioritize upgrading to Craft CMS version 5.10.13 or later to prevent server-side template injection attacks. Low-privilege control panel users with edit rights on a single element type should be closely monitored for suspicious activity.

Recommended defensive actions

• Upgrade to Craft CMS version 5.10.13 or later
• Monitor low-privilege control panel users with edit rights on a single element type for suspicious activity
• Review and restrict control panel access for low-privilege users
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 8.7 and affected versions of Craft CMS. Vendor advisory GHSA-5jmw-g85v-7jv2 and Vulncheck advisory details are also available.

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.