PHP
CVE-2026-28695
HIGH
GHSA-94rc-cqvm-m4pw
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionNVD
Craft is a content management system (CMS). There is an authenticated admin RCE in Craft CMS 5.8.21 via Server-Side Template Injection using the create() Twig function combined with a Symfony Process gadget chain. The create() Twig function exposes Craft::createObject(), which allows instantiation of arbitrary PHP classes with constructor arguments. Combined with the bundled symfony/process dependency, this enables RCE. This bypasses the fix implemented for CVE-2025-57811 (patched in 5.8.7). This vulnerability is fixed in 5.9.0-beta.1 and 4.17.0-beta.1.
AnalysisAI
Remote code execution in Craft CMS 5.8.21 allows authenticated administrators to execute arbitrary PHP code through Server-Side Template Injection in the create() Twig function combined with Symfony Process gadget chains. Public exploit code exists for this vulnerability, which bypasses the previous patch for CVE-2025-57811. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Authenticated admin account required on Craft CMS 5.8.21. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.2 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker (requires authentication) could exploit this vulnerability to compromise the affected system. |
| Remediation | A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Craft CMS 5.8.21 instances in your environment and restrict admin portal access to trusted IP ranges. …
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