5.8

CVE-2020-4037: oauth2_proxy_project oauth2_proxy Open Redirect

CVSS: 5.8v2.0MediumModified
AliasesGHSA-5m6c-jp6f-2vcvBIT-oauth2-proxy-2020-4037
Published 29-06-2020Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-4037 is a medium (CVSS 5.8) Open Redirect vulnerability in oauth2_proxy_project oauth2_proxy. EPSS estimates a 0.90% chance of exploitation in the next 30 days, higher than 58.9% of scored vulnerabilities.

Overall risk
23/100
0100
Low · default modelHow is this calculated?
CVSS score
5.8/10
010
Medium · v2.0 (NVD)
EPSS score
0.90%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 29-06-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

In OAuth2 Proxy from version 5.1.1 and less than version 6.0.0, 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. This has been fixed in version 6.0.0.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.90%

Chance of exploitation in the next 30 days

Percentile

59%

Versus all other CVEs

30-day change

0.00 pp

From 0.90% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.90%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Github.com/oauth2-proxy1 product
  • oauth2-proxy≥ 5.1.1, < 6.0.0
Oauth2 proxy1 product
Oauth2_proxy_project1 product

3 vendors · 3 products

References

4 links