What’s Vulnerable › Vulnerabilities

CVE-2026-23524: Laravel Redis Horizontal Scaling Insecure Deserialization

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-21 · updated 2026-06-17
• Weakness: CWE-502

Description

Laravel Reverb provides a real-time WebSocket communication backend for Laravel applications. In versions 1.6.3 and below, Reverb passes data from the Redis channel directly into PHP’s unserialize() function without restricting which classes can be instantiated, which leaves users vulnerable to Remote Code Execution. The exploitability of this vulnerability is increased because Redis servers are commonly deployed without authentication, but only affects Laravel Reverb when horizontal scaling is enabled (REVERB_SCALING_ENABLED=true). This issue has been fixed in version 1.7.0. As a workaround, require a strong password for Redis access and ensure the service is only accessible via a private network or local loopback, and/or set REVERB_SCALING_ENABLED=false to bypass the vulnerable logic entirely (if the environment uses only one Reverb node).

Affected products

• laravel reverb: before 1.7.0 — fixed in 1.7.0

How to fix

Upgrade to a fixed version: laravel reverb 1.7.0. Check the vendor advisory for mitigations.

References

• https://cwe.mitre.org/data/definitions/502.html
• https://github.com/laravel/reverb/commit/9ec26f8ffbb701f84920dd0bb9781a1797591f1a
• https://github.com/laravel/reverb/releases/tag/v1.7.0
• https://github.com/laravel/reverb/security/advisories/GHSA-m27r-m6rx-mhm4
• https://laravel.com/docs/12.x/reverb#scaling

Get alerted when CVE-2026-23524 or the next vulnerability affects your stack