PT-2021-14486 · Unknown · Oauth2 Proxy

Bohrasd + 1 · Published 2021-03-26 · Updated 2025-08-19 · CVE-2021-21411

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions OAuth2-Proxy versions 7.0.0 through 7.0.x

Description The --gitlab-group flag for group-based authorization in the GitLab provider stopped working, allowing any authenticated users to access applications regardless of --gitlab-group membership restrictions. This issue impacts GitLab Provider users who rely on group membership for authorization restrictions. The problem arose from a bug introduced while adding GitLab project-based authorization support, where the user session's groups field was populated with the --gitlab-group config entries instead of the individual user's group membership from the GitLab Userinfo endpoint.

Recommendations For OAuth2-Proxy versions 7.0.0 through 7.0.x, update to version 7.1.0 to resolve the issue. As a temporary workaround, consider setting --gitlab-project to use Project membership as the authorization checks instead of groups, as this feature is not affected by the bug.

Fix

Incorrect Authorization

Improper Authorization

Weakness Enumeration

CWE-863

CWE-285

Related Identifiers

BIT-OAUTH2-PROXY-2021-21411

CVE-2021-21411

GHSA-652X-M2GR-HPPM

GO-2025-3832

OPENSUSE-SU-2025:15434-1

SUSE-SU-2025:02912-1

Affected Products

Oauth2 Proxy

References · 48

• https://github.com/oauth2-proxy/oauth2-proxy/commit/0279fa7dff1752f1710707dbd1ffac839de8bbfc · Patch
• https://osv.dev/vulnerability/SUSE-SU-2025:02912-1 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-oauth2-proxy-2021-21411 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-21411 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-652x-m2gr-hppm · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-21411 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2025:15434-1 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2025-3832 · Vendor Advisory
• https://github.com/oauth2-proxy/oauth2-proxy · Note
• https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-652x-m2gr-hppm · Note
• https://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.1.0 · Note
• https://suse.com/security/cve/CVE-2025-7195 · Note
• https://suse.com/security/cve/CVE-2021-21411 · Note
• https://pkg.go.dev/github.com/oauth2-proxy/oauth2-proxy/v7 · Note
• https://suse.com/security/cve/CVE-2025-55001 · Note