cve.bz

CVE-2020-11053

6.1 mediumEPSS 0.8%

Medium (6.1) in oauth2 proxy project oauth2 proxy. EPSS 0.8% chance of exploitation in the next 30 days. Fixed in github.com/oauth2-proxy/oauth2-proxy 5.1.1.

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.

Severity

CVSS 3.1

6.1 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
0.8% chance of exploitation in the next 30 days; higher than 56% of CVEs (scores of 2026-10-31)
CWE
CWE-601
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-j7px-6hwj-hpjgGogithub.com/oauth2-proxy/oauth2-proxy<5.1.15.1.1

References

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