CVE-2020-4037

MEDIUM4.3EPSS 0.38%

Open Redirect in OAuth2 Proxy

Published: 12/20/2021Modified: 3/13/2026

Also known as:GHSA-5m6c-jp6f-2vcvBIT-oauth2-proxy-2020-4037

Description

### Impact As users can provide a redirect address for the proxy to send the authenticated user to at the end of the authentication flow. This is expected to be the original URL that the user was trying to access. This redirect URL is checked within the proxy and validated before redirecting the user to prevent malicious actors providing redirects to potentially harmful sites.

Affected packages (2)

Bitnami/oauth2-proxy>= 5.1.1, < 6.0.0
Go/github.com/oauth2-proxy/oauth2-proxy>= 5.1.1, < 6.0.0

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	MEDIUM4.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

References (4)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2020-4037
WEBhttps://github.com/oauth2-proxy/oauth2-proxy/commit/ee5662e0f5001d76ec76562bb605abbd07c266a2
WEBhttps://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v6.0.0
WEBhttps://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-5m6c-jp6f-2vcv