Open Redirect in OAuth2 Proxy
Priority LOW 30CWE-601Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-601.
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.
Why it matters now
EPSS 0.01304 70th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed OAuth2 Proxy (pusher): 5.0.0github.com/oauth2-proxy/oauth2-proxy (Go): 5.0.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| pusher | OAuth2 Proxy | before 5.0.0 | 5.0.0 | Patch available | CNA |
| — | github.com/oauth2-proxy/oauth2-proxy (Go) | before 5.0.0 | 5.0.0 | Patch available | GHSA-qqxw-m5fj-f7gv |
- OAuth2 Proxy Vendorpusher Affected before 5.0.0 Fixed in 5.0.0 Patch available CNA
- github.com/oauth2-proxy/oauth2-proxy (Go) Vendor— Affected before 5.0.0 Fixed in 5.0.0 Patch available GHSA-qqxw-m5fj-f7gv
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:*:*:*:*:*:*:*:* | before 5.0.0 | Vulnerable | oauth2-proxy |
- cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:*:*:*:*:*:*:*:* Versions before 5.0.0 Vulnerable ·oauth2-proxy
Remediation
- Fix · CNA OAuth2 Proxy (pusher) Fixed in 5.0.0
- Fix · GHSA-qqxw-m5fj-f7gv github.com/oauth2-proxy/oauth2-proxy (Go) Fixed in 5.0.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2020-5233
- 2026-10-03 Alias added: GHSA-qqxw-m5fj-f7gv
References
Advisory 2
Other 4
- https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-qqxw-m5fj-f7gv
- https://github.com/oauth2-proxy/oauth2_proxy/commit/a316f8a06f3c0ca2b5fc5fa18a91781b313607b2
- https://blog.detectify.com/2019/05/16/the-real-impact-of-an-open-redirect
- https://github.com/oauth2-proxy/oauth2_proxy/releases/tag/v5.0.0
More oauth2-proxy Oauth2 Proxy vulnerabilities
- TI-2025-34353 OAuth2-Proxy has authentication bypass in oauth2-proxy skip_auth_routes due to Query Parameter inclusion CVSS 3.1CRITICAL 9.1
- TI-2026-29315 OAuth2 Proxy has an Authentication Bypass via X-Forwarded-Uri Header Spoofing CVSS 3.1CRITICAL 9.1
- TI-2026-26722 OAuth2 Proxy: Health Check User-Agent Matching Bypasses Authentication in auth_request Mode CVSS 3.1CRITICAL 9.1
- TI-2026-29698 OAuth2 Proxy has an Authentication Bypass via Fragment Confusion in skip_auth_routes and skip_auth_regex CVSS 3.1HIGH 8.2
- TI-2017-14408 CSRF in Bitly oauth2_proxy 2.1 during authentication flow CVSS 3.0HIGH 8.8
- TI-2020-08927 Open Redirect in OAuth2 Proxy CVSS 3.1HIGH 7.1
Sources
- CVE-2020-5233 · CVE Program
- CVE-2020-5233 · NVD
- FIRST EPSS
- GHSA-qqxw-m5fj-f7gv · GitHub Advisory Database · CC BY 4.0
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