CVE-2018-15133: Laravel Deserialization of Untrusted Data Vulnerability

High severity, CVSS 8.1. Actively exploited: in CISA KEV since 2024-01-16. EPSS: 76.8% chance of exploitation in the next 30 days.

In Laravel Framework through 5.5.40 and 5.6.x through 5.6.29, remote code execution might occur as a result of an unserialize call on a potentially untrusted X-XSRF-TOKEN value. This involves the decrypt method in Illuminate/Encryption/Encrypter.php and PendingBroadcast in gadgetchains/Laravel/RCE/3/chain.php in phpggc. The attacker must know the application key, which normally would never occur, but could happen if the attacker previously had privileged access or successfully accomplished a previous attack.

Affected products

• Laravel Laravel: up to and including 5.5.40; from 5.6.0, up to and including 5.6.29

Published 2018-08-09. Last modified 2026-06-17.