Laravel Redis Horizontal Scaling Insecure Deserialization_CVE-2026-23524

9.8 / 10

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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).

Basic Information

ID CVE-2026-23524

Source GitHub_M

Published Jan 21, 2026 at 22:07

Modified Jan 22, 2026 at 16:49

Affected Product

Vendor laravel

Product reverb

Version < 1.7.0

Affected Versions laravel reverb < 1.7.0

CWE Classification

CWE-502

References

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    "published": "2026-01-21T22:07:55.682Z",
    "modified": "2026-01-22T16:49:37.182Z",
    "type": "cve",
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