What’s Vulnerable › Vulnerabilities

CVE-2024-25124: Fiber has Insecure CORS Configuration, Allowing Wildcard Origin with Credentials

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2024-02-21 · updated 2026-06-17
• Weakness: CWE-346

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.

Affected products

• gofiber fiber: before 2.52.1 — fixed in 2.52.1

How to fix

Upgrade to a fixed version: gofiber fiber 2.52.1. Check the vendor advisory for mitigations.

References

• http://blog.portswigger.net/2016/10/exploiting-cors-misconfigurations-for.html
• https://codeql.github.com/codeql-query-help/javascript/js-cors-misconfiguration-for-credentials
• https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS/Errors/CORSNotSupportingCredentials
• https://fetch.spec.whatwg.org/#cors-protocol-and-credentials
• https://github.com/gofiber/fiber/commit/f0cd3b44b086544a37886232d0530601f2406c23
• https://github.com/gofiber/fiber/releases/tag/v2.52.1
• https://github.com/gofiber/fiber/security/advisories/GHSA-fmg4-x8pw-hjhg
• https://saturncloud.io/blog/cors-cannot-use-wildcard-in-accesscontrolalloworigin-when-credentials-flag-is-true
• http://blog.portswigger.net/2016/10/exploiting-cors-misconfigurations-for.html
• https://codeql.github.com/codeql-query-help/javascript/js-cors-misconfiguration-for-credentials
• https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS/Errors/CORSNotSupportingCredentials
• https://fetch.spec.whatwg.org/#cors-protocol-and-credentials

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