Description

Fiber is a web framework written in go. Prior to version 2.52.1, the CORS middleware allows for insecure configurations that could potentially expose the application to multiple CORS-related vulnerabilities. Specifically, it allows setting the Access-Control-Allow-Origin header to a wildcard (`*`) while also having the Access-Control-Allow-Credentials set to true, which goes against recommended security best practices. The impact of this misconfiguration is high as it can lead to unauthorized access to sensitive user data and expose the system to various types of attacks listed in the PortSwigger article linked in the references. Version 2.52.1 contains a patch for this issue. As a workaround, users may manually validate the CORS configurations in their implementation to ensure that they do not allow a wildcard origin when credentials are enabled. The browser fetch api, as well as browsers and utilities that enforce CORS policies, are not affected by this.

Severity CRITICAL

CVSS Score 9.5

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

CWE CWE-346

Public Exploit ⚠️ Yes

Source NVD

Published 2024-02-21

Updated 2026-06-15

Modified 2025-02-05

Fix URL https://github.com/gofiber/fiber/commit/f0cd3b44b086544a37886232d0530601f2406c23

Software	From version	Fixed in
fiber	—	2.52.1
github.com/gofiber/fiber/v2	—	—