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Vulnerabilities

Vulnerability · CVE-2026-41059

OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers.

Published Apr 22, 2026 · catalog updated Jun 17, 2026 · oauth2 proxy project oauth2 proxy

Check if you run it

No confirmed exploitation is on record for CVE-2026-41059. EPSS is 0.43%. Act only if a listed version of oauth2 proxy project oauth2 proxy is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.43%
Remediation
Advisory link
Affected products
cpe oauth2 proxy project/oauth2 proxy

OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Versions 7.5.0 through 7.15.1 have a configuration-dependent authentication bypass. Deployments are affected when all of the following are true: Use of or the legacy ; use of patterns that can be widened by attacker-controlled suffixes, such as causing potential exposure of ; and protected upstream applications that interpret as a fragment delimiter or otherwise route the request to the protected base path. In deployments that rely on these settings, an unauthenticated attacker can send a crafted request containing a number sign in the path, including the browser-safe encoded form , so that OAuth2 Proxy matches a public allowlist rule while the backend serves a protected resource. Deployments that do not use these skip-auth options, or that only allow exact public paths with tightly scoped method and path rules, are not affected. A fix has been implemented in version 7.15.2 to normalize request paths more conservatively before skip-auth matching so fragment content does not influence allowlist decisions. Users who cannot upgrade immediately can reduce exposure by tightening or removing and rules, especially patterns that use broad wildcards across path segments. Recommended mitigations include replacing broad rules with exact, anchored public paths and explicit HTTP methods; rejecting requests whose path contains or at the ingress, load balancer, or WAF level; and/or avoiding placing sensitive application paths behind broad rules.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe oauth2 proxy project/oauth2 proxyversion unspecified

How to fix CVE-2026-41059

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-41059. EPSS is 0.43%. Act only if a listed version of oauth2 proxy project oauth2 proxy is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-288. EPSS 0.43%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 22, 2026 · NIST NVD

    Detected

    OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Versions 7.5.0 through 7.15.1 have a configuration-dependent authentication bypass. Deployments are affected when all of the following are true: Use of or the legacy ; use of patterns that can be widened by attacker-controlled suffixes, such as causing potential exposure of ; and protected upstream applications th

  2. Jun 17, 2026 · NIST NVD

    Updated

    OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Versions 7.5.0 through 7.15.1 have a configuration-dependent authentication bypass. Deployments are affected when all of the following are true: Use of or the legacy ; use of patterns that can be widened by attacker-controlled suffixes, such as causing potential exposure of ; and protected upstream applications th

Sources

  • CVE.orgVulnerability recordCVE-2026-41059

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-41059

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-41059

    OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Versions 7.5.0 through 7.15.1 have a configuration-dependent authentication bypass. Deployments are affected when all of the following are true: Use of or the legacy `skip_auth

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.