SOURCE FACT
Laravel · Laravel Framework
Laravel Framework contains a deserialization of untrusted data vulnerability, allowing for remote command execution. This vulnerability may only be exploited if a malicious user has accessed the application encryption key (APP_KEY environment variable).
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA notes
https://laravel.com/docs/5.6/upgrade#upgrade-5.6.30; https://nvd.nist.gov/vuln/detail/CVE-2018-15133
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