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8 vulnerabilities by oauth2_proxy_project

CVE-2025-54576 (GCVE-0-2025-54576)

Vulnerability from cvelistv5 – Published: 2025-07-30 19:41 – Updated: 2025-07-30 19:55
VLAI?
Summary
OAuth2-Proxy is an open-source tool that can act as either a standalone reverse proxy or a middleware component integrated into existing reverse proxy or load balancer setups. In versions 7.10.0 and below, oauth2-proxy deployments are vulnerable when using the skip_auth_routes configuration option with regex patterns. Attackers can bypass authentication by crafting URLs with query parameters that satisfy configured regex patterns, allowing unauthorized access to protected resources. The issue stems from skip_auth_routes matching against the full request URI. Deployments using skip_auth_routes with regex patterns containing wildcards or broad matching patterns are most at risk. This issue is fixed in version 7.11.0. Workarounds include: auditing all skip_auth_routes configurations for overly permissive patterns, replacing wildcard patterns with exact path matches where possible, ensuring regex patterns are properly anchored (starting with ^ and ending with $), or implementing custom validation that strips query parameters before regex matching.
Severity ?
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-290 - Authentication Bypass by Spoofing
Assigner
References
Impacted products
Vendor Product Version
oauth2-proxy oauth2-proxy Affected: < 7.11.0
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Show details on NVD website
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CVE-2021-21411 (GCVE-0-2021-21411)

Vulnerability from cvelistv5 – Published: 2021-03-26 20:55 – Updated: 2024-08-03 18:09
VLAI?
Summary
OAuth2-Proxy is an open source reverse proxy that provides authentication with Google, Github or other providers. The `--gitlab-group` flag for group-based authorization in the GitLab provider stopped working in the v7.0.0 release. Regardless of the flag settings, authorization wasn't restricted. Additionally, any authenticated users had whichever groups were set in `--gitlab-group` added to the new `X-Forwarded-Groups` header to the upstream application. While adding GitLab project based authorization support in #630, a bug was introduced where the user session's groups field was populated with the `--gitlab-group` config entries instead of pulling the individual user's group membership from the GitLab Userinfo endpoint. When the session groups where compared against the allowed groups for authorization, they matched improperly (since both lists were populated with the same data) so authorization was allowed. This impacts GitLab Provider users who relies on group membership for authorization restrictions. Any authenticated users in your GitLab environment can access your applications regardless of `--gitlab-group` membership restrictions. This is patched in v7.1.0. There is no workaround for the Group membership bug. But `--gitlab-project` can be set to use Project membership as the authorization checks instead of groups; it is not broken.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
CWE
  • CWE-863 - Incorrect Authorization
Assigner
References
Impacted products
Vendor Product Version
oauth2-proxy oauth2-proxy Affected: >= 7.0.0, < 7.1.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-21291 (GCVE-0-2021-21291)

Vulnerability from cvelistv5 – Published: 2021-02-02 19:05 – Updated: 2024-08-03 18:09
VLAI?
Summary
OAuth2 Proxy is an open-source reverse proxy and static file server that provides authentication using Providers (Google, GitHub, and others) to validate accounts by email, domain or group. In OAuth2 Proxy before version 7.0.0, for users that use the whitelist domain feature, a domain that ended in a similar way to the intended domain could have been allowed as a redirect. For example, if a whitelist domain was configured for ".example.com", the intention is that subdomains of example.com are allowed. Instead, "example.com" and "badexample.com" could also match. This is fixed in version 7.0.0 onwards. As a workaround, one can disable the whitelist domain feature and run separate OAuth2 Proxy instances for each subdomain.
Severity ?
4.7 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE
  • CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
Impacted products
Vendor Product Version
oauth2-proxy oauth2-proxy Affected: < 7.0.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2020-4037 (GCVE-0-2020-4037)

Vulnerability from cvelistv5 – Published: 2020-06-29 19:45 – Updated: 2024-08-04 07:52
VLAI?
Summary
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.
Severity ?
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CWE
  • CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
Impacted products
Vendor Product Version
OAuth2 Proxy OAuth2 Proxy Affected: >= 5.1.1, < 6.0.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2020-11053 (GCVE-0-2020-11053)

Vulnerability from cvelistv5 – Published: 2020-05-07 20:30 – Updated: 2024-08-04 11:21
VLAI?
Summary
In OAuth2 Proxy before 5.1.1, there is an open redirect vulnerability. 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. However, by crafting a redirect URL with HTML encoded whitespace characters the validation could be bypassed and allow a redirect to any URL provided. This has been patched in 5.1.1.
Severity ?
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
CWE
  • CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
Impacted products
Vendor Product Version
OAuth2 Proxy OAuth2 Proxy Affected: < 5.1.1
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2020-5233 (GCVE-0-2020-5233)

Vulnerability from cvelistv5 – Published: 2020-01-30 17:45 – Updated: 2024-08-04 08:22
VLAI?
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.
Severity ?
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:H/A:L
CWE
  • CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Assigner
References
Impacted products
Vendor Product Version
pusher OAuth2 Proxy Affected: < 5.0.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2017-1000070 (GCVE-0-2017-1000070)

Vulnerability from cvelistv5 – Published: 2017-07-13 20:00 – Updated: 2024-08-05 21:53
VLAI?
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
Severity ?
No CVSS data available.
CWE
  • n/a
Assigner
References
Show details on NVD website
To clipboard 

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CVE-2017-1000069 (GCVE-0-2017-1000069)

Vulnerability from cvelistv5 – Published: 2017-07-13 20:00 – Updated: 2024-08-05 21:53
VLAI?
Summary
CSRF in Bitly oauth2_proxy 2.1 during authentication flow
Severity ?
No CVSS data available.
CWE
  • n/a
Assigner
References
Show details on NVD website
To clipboard 

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