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CVE-2020-5233

17
FAUCET Score

CVE-2020-5233 describes an open redirect vulnerability in OAuth2 Proxy versions prior to 5.0, allowing attackers to silently harvest authentication tokens. This medium-severity vulnerability (CVSS 6.1) has a low attack complexity and requires user interaction, potentially leading to limited confidentiality and integrity impacts. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.0.0CPE matchmatch criteria
cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
HIGH
Availability Impact
LOW
Exploitability Score
1.2
Impact Score
4.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.12%
Probability of exploitation in next 30 days
EPSS Percentile
62.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0112 is in the 76th percentile among its peer group of 26,234 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/oauth2-proxy/oauth2-proxyFixed in: 5.0.0

Vendor Advisories (1)

goGHSA-qqxw-m5fj-f7gvmedium

The pattern '/\domain.com' is not disallowed when redirecting, allowing for open redirect

Dec 20, 2021

References

github.com / pusher/oauth2_proxy/commit/a316f8a06f3c0ca2b5fc5fa18a91781b313607b2
PatchThird Party Advisory
github.com / pusher/oauth2_proxy/releases/tag/v5.0.0
Release NotesThird Party Advisory
github.com / pusher/oauth2_proxy/security/advisories/GHSA-qqxw-m5fj-f7gv
ExploitPatchThird Party Advisory