The Bitly oauth2_proxy in version 2.1 and earlier was affected by an open redirect…
Priority LOW 29CWE-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 3.0 · NVD. Fix status from CNA and GitHub. Impact type from CWE-601.
Summary
The Bitly oauth2_proxy in version 2.1 and earlier was affected by an open redirect vulnerability during the start and termination of the 2-legged OAuth flow. This issue was caused by improper input validation and a violation of RFC-6819
Why it matters now
EPSS 0.00996 62nd percentileScored 2026-11-07
Fix Fixed github.com/bitly/oauth2_proxy (Go): 2.2.0
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 |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | github.com/bitly/oauth2_proxy (Go) | before 2.2.0 | 2.2.0 | Patch available | GHSA-jm34-xm8m-w958 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- github.com/bitly/oauth2_proxy (Go) Vendor— Affected before 2.2.0 Fixed in 2.2.0 Patch available GHSA-jm34-xm8m-w958
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:*:*:*:*:*:*:*:* | up to 2.1 | Vulnerable | oauth2-proxy |
- cpe:2.3:a:oauth2_proxy_project:oauth2_proxy:*:*:*:*:*:*:*:* Versions up to 2.1 Vulnerable ·oauth2-proxy
Remediation
- Fix · GHSA-jm34-xm8m-w958 github.com/bitly/oauth2_proxy (Go) Fixed in 2.2.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2017-1000070
- 2026-10-03 Alias added: GHSA-jm34-xm8m-w958
References
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-2017-1000070 · CVE Program
- CVE-2017-1000070 · NVD
- FIRST EPSS
- GHSA-jm34-xm8m-w958 · GitHub Advisory Database · CC BY 4.0
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