# github.com/oauth2-proxy/oauth2-proxy (Go) vulnerabilities

Source: https://junglewise.ai/threats/technologies/github-com-oauth2-proxy-oauth2-proxy  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/github-com-oauth2-proxy-oauth2-proxy.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 12 vulnerabilities in github.com/oauth2-proxy/oauth2-proxy (Go): 0 in the last 7 days and 0 in the last 90 days, 2 of them critical and 0 exploited in the wild. The most recent, CVE-2026-41059, was published on 22 April 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 12 (2 critical, 0 exploited in the wild)

## About github.com/oauth2-proxy/oauth2-proxy (Go)

Reverse proxy for adding OAuth2 authentication to web applications and APIs.

## Latest github.com/oauth2-proxy/oauth2-proxy (Go) vulnerabilities

- [CVE-2026-41059: OAuth2 Proxy has an Authentication Bypass via Fragment Confusion in skip_auth_routes and skip_auth_regex](https://junglewise.ai/threats/cve-2026-41059-oauth2-proxy-has-an-authentication-bypass-via-fragment-confusion) (high, CVSS 8.2, published 22 Apr 2026)
- [CVE-2026-40575: OAuth2 Proxy authentication bypass via X-Forwarded-Uri spoofing](https://junglewise.ai/threats/cve-2026-40575-oauth2-proxy-authentication-bypass-via-x-forwarded-uri-spoofing) (critical, CVSS 9.1, published 22 Apr 2026)
- [CVE-2026-40574: OAuth2 Proxy has an Authorization Bypass in Email Domain Validation via Malformed Multi-@ Email Claims](https://junglewise.ai/threats/cve-2026-40574-oauth2-proxy-has-an-authorization-bypass-in-email-domain) (medium, CVSS 6.8, published 21 Apr 2026)
- [CVE-2026-34457: OAuth2 Proxy authentication bypass via health check User-Agent spoofing](https://junglewise.ai/threats/cve-2026-34457-oauth2-proxy-authentication-bypass-via-health-check-user-agent) (critical, CVSS 9.1, published 14 Apr 2026)
- [CVE-2026-34454: OAuth2 Proxy insufficient session expiration in sign-in page handler](https://junglewise.ai/threats/cve-2026-34454-oauth2-proxy-insufficient-session-expiration-in-sign-in-page) (low, CVSS 3.5, published 14 Apr 2026)
- [CVE-2025-64484: OAuth2-Proxy is vulnerable to header smuggling via underscore leading to potential privilege escalation](https://junglewise.ai/threats/cve-2025-64484-oauth2-proxy-is-vulnerable-to-header-smuggling-via-underscore) (low, CVSS 3.1, published 17 Nov 2025)
- [CVE-2025-54576: OAuth2-Proxy has authentication bypass in oauth2-proxy skip_auth_routes due to Query Parameter inclusion](https://junglewise.ai/threats/cve-2025-54576-oauth2-proxy-has-authentication-bypass-in-oauth2-proxy-skip-auth) (low, CVSS 3.1, published 11 Aug 2025)
- [CVE-2021-21411: OAuth2-Proxy's `--gitlab-group` GitLab Group Authorization config flag stopped working in v7.0.0](https://junglewise.ai/threats/cve-2021-21411-oauth2-proxy-s-gitlab-group-gitlab-group-authorization-config) (low, CVSS 3.1, published 11 Aug 2025)
- [CVE-2021-21291: Subdomain checking of whitelisted domains could allow unintended redirects in oauth2-proxy](https://junglewise.ai/threats/cve-2021-21291-subdomain-checking-of-whitelisted-domains-could-allow-unintended) (low, CVSS 3.1, published 21 Aug 2024)
- [CVE-2020-5233: The pattern '/\domain.com' is not disallowed when redirecting, allowing for open redirect](https://junglewise.ai/threats/cve-2020-5233-the-pattern-domain-com-is-not-disallowed-when-redirecting-allowing) (low, CVSS 3.1, published 20 Dec 2021)
- [CVE-2020-11053: Open Redirect in OAuth2 Proxy](https://junglewise.ai/threats/cve-2020-11053-open-redirect-in-oauth2-proxy) (low, CVSS 3.1, published 20 Dec 2021)
- [CVE-2020-4037: Open Redirect in OAuth2 Proxy](https://junglewise.ai/threats/cve-2020-4037-open-redirect-in-oauth2-proxy) (low, CVSS 3.1, published 20 Dec 2021)

## Most severe github.com/oauth2-proxy/oauth2-proxy (Go) vulnerabilities

- [CVE-2026-34457: OAuth2 Proxy authentication bypass via health check User-Agent spoofing](https://junglewise.ai/threats/cve-2026-34457-oauth2-proxy-authentication-bypass-via-health-check-user-agent) (critical, CVSS 9.1, published 14 Apr 2026)
- [CVE-2026-40575: OAuth2 Proxy authentication bypass via X-Forwarded-Uri spoofing](https://junglewise.ai/threats/cve-2026-40575-oauth2-proxy-authentication-bypass-via-x-forwarded-uri-spoofing) (critical, CVSS 9.1, published 22 Apr 2026)
- [CVE-2026-41059: OAuth2 Proxy has an Authentication Bypass via Fragment Confusion in skip_auth_routes and skip_auth_regex](https://junglewise.ai/threats/cve-2026-41059-oauth2-proxy-has-an-authentication-bypass-via-fragment-confusion) (high, CVSS 8.2, published 22 Apr 2026)
- [CVE-2026-40574: OAuth2 Proxy has an Authorization Bypass in Email Domain Validation via Malformed Multi-@ Email Claims](https://junglewise.ai/threats/cve-2026-40574-oauth2-proxy-has-an-authorization-bypass-in-email-domain) (medium, CVSS 6.8, published 21 Apr 2026)
- [CVE-2026-34454: OAuth2 Proxy insufficient session expiration in sign-in page handler](https://junglewise.ai/threats/cve-2026-34454-oauth2-proxy-insufficient-session-expiration-in-sign-in-page) (low, CVSS 3.5, published 14 Apr 2026)
- [CVE-2021-21291: Subdomain checking of whitelisted domains could allow unintended redirects in oauth2-proxy](https://junglewise.ai/threats/cve-2021-21291-subdomain-checking-of-whitelisted-domains-could-allow-unintended) (low, CVSS 3.1, published 21 Aug 2024)
- [CVE-2020-5233: The pattern '/\domain.com' is not disallowed when redirecting, allowing for open redirect](https://junglewise.ai/threats/cve-2020-5233-the-pattern-domain-com-is-not-disallowed-when-redirecting-allowing) (low, CVSS 3.1, published 20 Dec 2021)
- [CVE-2025-54576: OAuth2-Proxy has authentication bypass in oauth2-proxy skip_auth_routes due to Query Parameter inclusion](https://junglewise.ai/threats/cve-2025-54576-oauth2-proxy-has-authentication-bypass-in-oauth2-proxy-skip-auth) (low, CVSS 3.1, published 11 Aug 2025)
- [CVE-2021-21411: OAuth2-Proxy's `--gitlab-group` GitLab Group Authorization config flag stopped working in v7.0.0](https://junglewise.ai/threats/cve-2021-21411-oauth2-proxy-s-gitlab-group-gitlab-group-authorization-config) (low, CVSS 3.1, published 11 Aug 2025)
- [CVE-2020-4037: Open Redirect in OAuth2 Proxy](https://junglewise.ai/threats/cve-2020-4037-open-redirect-in-oauth2-proxy) (low, CVSS 3.1, published 20 Dec 2021)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other Go technologies

- [github.com/mattermost/mattermost-server (Go)](https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server): 297 vulnerabilities
- [github.com/mattermost/mattermost-server/v6 (Go)](https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server-v6): 222 vulnerabilities
- [github.com/mattermost/mattermost/server/v8 (Go)](https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server-v8): 207 vulnerabilities
- [github.com/mattermost/mattermost-server/v5 (Go)](https://junglewise.ai/threats/technologies/github-com-mattermost-mattermost-server-v5): 199 vulnerabilities
- [stdlib (Go)](https://junglewise.ai/threats/technologies/go-stdlib): 178 vulnerabilities
- [github.com/siyuan-note/siyuan/kernel (Go)](https://junglewise.ai/threats/technologies/github-com-siyuan-note-siyuan-kernel): 160 vulnerabilities
- [code.gitea.io/gitea (Go)](https://junglewise.ai/threats/technologies/code-gitea-io-gitea): 126 vulnerabilities
- [code.vikunja.io/api (Go)](https://junglewise.ai/threats/technologies/code-vikunja-io-api): 91 vulnerabilities
- [gogs.io/gogs (Go)](https://junglewise.ai/threats/technologies/gogs-io-gogs): 81 vulnerabilities
- [github.com/traefik/traefik/v2 (Go)](https://junglewise.ai/threats/technologies/github-com-traefik-traefik-v2): 78 vulnerabilities
- [github.com/traefik/traefik (Go)](https://junglewise.ai/threats/technologies/github-com-traefik-traefik): 75 vulnerabilities
- [github.com/usememos/memos (Go)](https://junglewise.ai/threats/technologies/github-com-usememos-memos): 75 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "github.com/oauth2-proxy/oauth2-proxy (Go) vulnerabilities", https://junglewise.ai/threats/technologies/github-com-oauth2-proxy-oauth2-proxy, 13 November 2026.