Authenticated RCE via unchecked group filter rendering
Published Jan 5, 2026 · Updated Jan 5, 2026
Twig SSTI in Craft CMS 4.0.0-RC1 through 4.16.16 and 5.0.0-RC1 through 5.8.20 allows remote authenticated users to execute code. Extension::groupFilter embeds an attacker-controlled string in an object template without checkArrowFunction validation, allowing a nested map filter to invoke PHP callables such as system or exec. Exploitation requires an administrator with allowAdminChanges enabled or a non-administrator permitted to use System Messages, and successful execution runs code in the Craft server process.
Summary
What happened
Twig SSTI in Craft CMS 4.0.0-RC1 through 4.16.16 and 5.0.0-RC1 through 5.8.20 allows remote authenticated users to execute code. Extension::groupFilter embeds an attacker-controlled string in an object template without checkArrowFunction validation, allowing a nested map filter to invoke PHP callables such as system or exec. Exploitation requires an administrator with allowAdminChanges enabled or a non-administrator permitted to use System Messages, and successful execution runs code in the Craft server process.
The record
- CVE
- CVE-2025-68454
- Published
- Jan 5, 2026
- Updated
- Jan 5, 2026
- Vendor
- Pixel & Tonic
- Product
- Craft CMS
- Classifications
- CWE-1336, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 5, 2026CVE publishedPublication date reported by the CVE source.
- Jan 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 4.0.0-RC1, < 4.16.17
- Affected versionversion=>= 5.0.0-RC1, < 5.8.21
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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