Gofiber Fiber up to 2.52.2 CORS Middleware middleware/cors/utils.go cross-domain policy

Summaryinfo

A vulnerability, which was classified as problematic, was found in Gofiber Fiber up to 2.52.2. This vulnerability affects unknown code of the file middleware/cors/utils.go of the component CORS Middleware. Executing a manipulation can lead to cross-domain policy. The identification of this vulnerability is CVE-2026-119285. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Gofiber Fiber up to 2.52.2. It has been declared as problematic. This vulnerability affects some unknown functionality of the file middleware/cors/utils.go of the component CORS Middleware. The manipulation with an unknown input leads to a cross-domain policy vulnerability. The CWE definition for the vulnerability is CWE-942. The product uses a cross-domain policy file that includes domains that should not be trusted. As an impact it is known to affect confidentiality. CVE summarizes:

Fiber is an Express inspired web framework written in Go. From 2.52.1 until 2.52.3, the CORS middleware's validateDomain wildcard matcher in middleware/cors/utils.go strips the scheme and checks only a host suffix without requiring a dot boundary. An application configured with a wildcard-subdomain AllowOrigins value and AllowCredentials enabled can reflect an unrelated attacker-controlled origin whose host merely ends with the configured base domain. A user who visits that origin can expose authenticated cross-origin responses to the attacker's page; empty-label origins and later comma-space parsing hardening are outside this advisory. This issue is fixed in version 2.52.3.

The advisory is available at github.com. This vulnerability was named CVE-2026-119285 since 10/29/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 2.52.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-113402). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• Gofiber

Name

• Fiber

Version

• 2.52.0
• 2.52.1
• 2.52.2

Website

• Product: https://github.com/gofiber/fiber/

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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