In OAuth2 Proxy before 5.1.1, there is an open redirect vulnerability. 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. However, by crafting a redirect URL with HTML encoded whitespace characters the validation could be bypassed and allow a redirect to any URL provided. This has been patched in 5.1.1.
History

Mon, 23 Feb 2026 18:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2020-05-07T20:30:13.000Z

Updated: 2024-08-04T11:21:14.610Z

Reserved: 2020-03-30T00:00:00.000Z

Link: CVE-2020-11053

cve-icon Vulnrichment

Updated: 2024-08-04T11:21:14.610Z

cve-icon NVD

Status : Modified

Published: 2020-05-07T21:15:11.530

Modified: 2024-11-21T04:56:41.273

Link: CVE-2020-11053

cve-icon Redhat

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