CVE-2020-4037

Open Redirect in OAuth2 Proxy

MEDIUM
5.4
CVSS Score
Published: June 29, 2020 at 07:45 PM UTC
Updated: June 17, 2026 at 03:19 AM UTC
2 products affected across 2 vendorsOAUTH2 ProxyOAuth2 Proxy

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.9%

Description

In OAuth2 Proxy from version 5.1.1 and less than version 6.0.0, 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. This has been fixed in version 6.0.0.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

5.1.1 ≤ v < 6.0.0
Affected range stops below 6.0.0, so it looks safe — our inference, not a vendor statement
v < 6.0.0
Affected range stops below 6.0.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-601

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