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    CVE-2020-4037

    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.

    Published:Jun 29, 2020
    Last Modified:Nov 21, 2024
    EPS:Jun 29, 2020
    EPSS Score:0.00321
    CVSS Score:4.3

    Affected Products

    Vendor
    Oauth2 Proxy Project
    Product
    Oauth2 Proxy

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-178 Cross-Site Flashing

    Related CVEs

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    CVE-2026-34457 (CVSS 9.1) — OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Versions prior to 7.15.2 …
    CVE-2026-34454 (CVSS 3.5) — OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. A regression introduced i…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High