CVE-2017-1000069: Cross-site Request Forgery (CSRF) in Bitly oauth2_proxy
Summary
CVE-2017-1000069: Cross-site Request Forgery (CSRF). Affects github.com/bitly/oauth2_proxy versions < 2.2.0. Fixed in 2.2.0. How to fix ↓
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Background
Bitly oauth2_proxy is a Go package that provides a reverse proxy for authenticating requests using OAuth2. It is commonly used to secure web applications by handling authentication and authorization. The package integrates with various OAuth2 providers, allowing users to authenticate using their existing accounts. However, a vulnerability has been discovered in version 2.1 of oauth2_proxy that allows for Cross-site Request Forgery (CSRF) attacks during the authentication flow.
Vulnerability Detail
The CSRF vulnerability in Bitly oauth2_proxy 2.1 occurs during the authentication flow. An attacker can craft a malicious request that, when executed by an authenticated user, performs unintended actions on their behalf. This can lead to unauthorized access, data manipulation, or other malicious activities. The vulnerability has a CVSS score of 8.8, indicating a high severity level.
How To Fix
Latest published version: v2.0.1+incompatible as of 22 Oct 2026
go get github.com/bitly/oauth2_proxy@v2.0.1+incompatibleUpgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
2.2.0
This is the first release that contains the fix.
go get github.com/bitly/oauth2_proxy@v2.2.0Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no known workaround for this vulnerability. It is essential to upgrade to the fixed version to mitigate the risk of CSRF attacks.
Conclusion
The CSRF vulnerability in Bitly oauth2_proxy 2.1 poses a significant security risk, allowing attackers to perform unauthorized actions on behalf of authenticated users. To mitigate this risk, it is crucial to upgrade to version 2.2 or later of oauth2_proxy. This upgrade includes patches and security enhancements that prevent CSRF attacks during the authentication flow. For further support on vulnerability remediation, you can contact DevNack.com.
See every vulnerability recorded for github.com/bitly/oauth2_proxy →
FAQ
Cross-site Request Forgery (CSRF) is an attack that tricks the victim into submitting a malicious request. It occurs when an attacker can force a user's browser to make a request on their behalf, potentially leading to unauthorized actions.
The CSRF vulnerability in Bitly oauth2_proxy can allow an attacker to perform actions on behalf of an authenticated user. This can lead to unauthorized access, data manipulation, or other malicious activities depending on the actions allowed by the application.
You can use Vulert's playground (https://vulert.com/scanner) to check if your application is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities, providing information without requiring access to the code or installation.
Yes, upgrading to version 2.2 or later of Bitly oauth2_proxy fixes the CSRF vulnerability. It is recommended to update to the latest version to ensure your application is protected.
For more information about this vulnerability, you can refer to the GitHub Advisory Database (https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/12/GHSA-rrm8-32g4-w8m3/GHSA-rrm8-32g4-w8m3.json).
References
Related vulnerabilities
Recent vulnerabilities recorded for github.com/bitly/oauth2_proxy.
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