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

> CVE-2018-15133: Laravel Deserialization of Untrusted Data Vulnerability. CVSS 8.1 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2018-15133
Last updated: 2025-10-21T23:45:49Z

- Published: 2018-08-09 19:00 UTC · Updated: 2025-10-21 23:45 UTC · Assigner: mitre
- CVSS: 8.1 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 76.6%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2024-01-16, federal due date 2024-02-06, ransomware use: Unknown

## Description

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.

## CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

## Affected vendors and products

- Laravel: Laravel Framework

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2018-15133)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2018-15133)
- [http://packetstormsecurity.com/files/153641/PHP-Laravel-Framework-Token-Unserialize-Remote-Command-Execution.html](http://packetstormsecurity.com/files/153641/PHP-Laravel-Framework-Token-Unserialize-Remote-Command-Execution.html)
- [https://laravel.com/docs/5.6/upgrade\#upgrade-5.6.30](https://laravel.com/docs/5.6/upgrade#upgrade-5.6.30)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2018-15133 · Markdown: https://rewindex.com/cve/CVE-2018-15133.md · JSON: https://rewindex.com/api/v1/cves/CVE-2018-15133 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:46:23.506Z