# OAuth2 Proxy vulnerabilities

Source: https://junglewise.ai/threats/vendors/oauth2-proxy  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/vendors/oauth2-proxy.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 4 vulnerabilities in OAuth2 Proxy: 0 in the last 7 days and 1 in the last 90 days, 3 of them critical and 0 exploited in the wild. The most recent, CVE-2026-76835, was published on 24 August 2026. Nothing was published in the last eight weeks. 1 technology has a page of its own.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 1
- All time: 4 (3 critical, 0 exploited in the wild)

## About OAuth2 Proxy

An open-source project providing a reverse proxy and static file server that provides authentication using Providers to validate accounts by email, domain or group.

## Latest OAuth2 Proxy vulnerabilities

- [CVE-2026-76835: OAuth2 Proxy authentication bypass via spoofed X-Forwarded-Uri header](https://junglewise.ai/threats/cve-2026-76835-oauth2-proxy-authentication-bypass-via-spoofed-x-forwarded-uri) (critical, CVSS 9.1, published 24 Aug 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-2026-34457: 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)

## Most severe OAuth2 Proxy 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-2026-76835: OAuth2 Proxy authentication bypass via spoofed X-Forwarded-Uri header](https://junglewise.ai/threats/cve-2026-76835-oauth2-proxy-authentication-bypass-via-spoofed-x-forwarded-uri) (critical, CVSS 9.1, published 24 Aug 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-2026-34454: 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)

## 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 | 1 | 1 | 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 |

## OAuth2 Proxy technologies

- [OAuth2 Proxy](https://junglewise.ai/threats/technologies/oauth2-proxy): 4 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, "OAuth2 Proxy vulnerabilities", https://junglewise.ai/threats/vendors/oauth2-proxy, 9 November 2026.