CVE-2020-5233

Name: CVE-2020-5233
Creator: NVD / NIST
Published: 2020-01-30T19:15:11.883+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.12%

Last modified Jun 17, 2026

CVE-2020-5233 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. OAuth2 Proxy before 5.0 has an open redirect vulnerability. Authentication tokens could be silently harvested by an attacker. EPSS estimates a 1.12% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

1.12%

62.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Oauth2 Proxy Project	Oauth2 Proxy	< 5.0.0

References

https://github.com/pusher/oauth2_proxy/commit/a316f8a06f3c0ca2b5fc5fa18a91781b313607b2Patch, Third Party Advisory
https://github.com/pusher/oauth2_proxy/releases/tag/v5.0.0Release Notes, Third Party Advisory
https://github.com/pusher/oauth2_proxy/security/advisories/GHSA-qqxw-m5fj-f7gvExploit, Patch, Third Party Advisory
https://github.com/pusher/oauth2_proxy/commit/a316f8a06f3c0ca2b5fc5fa18a91781b313607b2Patch, Third Party Advisory
https://github.com/pusher/oauth2_proxy/releases/tag/v5.0.0Release Notes, Third Party Advisory
https://github.com/pusher/oauth2_proxy/security/advisories/GHSA-qqxw-m5fj-f7gvExploit, Patch, Third Party Advisory

Timeline

Published: Jan 30, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-5233?

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.

How severe is CVE-2020-5233?

CVE-2020-5233 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.12% probability of exploitation in the next 30 days.

How do I fix CVE-2020-5233?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-5233?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST