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Fencer Intel
medium 5.9

CVE-2020-5233 json

Open Redirect in OAuth2 Proxy

published 6y ago modified 2mo ago also BIT-oauth2-proxy-2020-5233 , EUVD-2021-2572 , GHSA-qqxw-m5fj-f7gv

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

OAuth2 Proxy before 5.0 has an open redirect vulnerability. Authentication tokens could be silently harvested by an attacker. This has been patched in version 5.0.

Patch / fix

  • go github.com/oauth2-proxy/oauth2-proxy 5.0.0
  • bitnami oauth2-proxy 5.0.0
  • oauth2_proxy_project oauth2_proxy 5.0.0

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Exploit prediction

1.30% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/pusher/oauth2_proxy/security/advisories/GHSA-qqxw-m5fj-f7gv referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:H/A:L
GitHub 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:H/A:L
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N
OSV 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
go github.com/oauth2-proxy/oauth2-proxy
<5.0.0
5.0.0
bitnami oauth2-proxy
<5.0.0
5.0.0

Affected products

  • pusher OAuth2 Proxy

Classification

Weakness
  • CWE-601 URL Redirection to Untrusted Site

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.