What’s Vulnerable › Vulnerabilities

CVE-2017-20146: Improper access control in github.com/gorilla/handlers

• 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: none known
• Published: 2022-12-27 · updated 2026-06-17
• Weakness: CWE-346

Description

Usage of the CORS handler may apply improper CORS headers, allowing the requester to explicitly control the value of the Access-Control-Allow-Origin header, which bypasses the expected behavior of the Same Origin Policy.

Affected products

• github.com/gorilla/handlers: before 1.3.0 — fixed in 1.3.0

How to fix

Upgrade to a fixed version: github.com/gorilla/handlers 1.3.0. Check the vendor advisory for mitigations.

References

• https://github.com/gorilla/handlers/commit/90663712d74cb411cbef281bc1e08c19d1a76145
• https://github.com/gorilla/handlers/pull/116
• https://pkg.go.dev/vuln/GO-2020-0020
• https://github.com/gorilla/handlers/commit/90663712d74cb411cbef281bc1e08c19d1a76145
• https://github.com/gorilla/handlers/pull/116
• https://pkg.go.dev/vuln/GO-2020-0020

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