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CVE-2020-11053

7.1
HIGHCVSS v3.1 Base Score
0.79%
LOW RiskEPSS (52nd percentile)

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.

Published: 5/7/2020
Modified: 6/17/2026
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Vulnerability Summary

CVSS v3 Score

7.1HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

CVSS v2 Score

5.8

AV:N/AC:M/Au:N/C:P/I:P/A:N

EPSS Score (Exploitation Probability)

0.79%LOW Exploitation Risk
52nd percentile

This vulnerability has a 0.79% probability of being exploited in the next 30 days, ranking higher than 52% of all scored CVEs.

CWE Classification

Related Vulnerabilities

Same Weakness Type(CWE-601)

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