CVE-2026-41059
OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers.
Published Apr 22, 2026 · corrected/updated Jun 17, 2026 · oauth2 proxy project oauth2 proxy · evidence confidence medium
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.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-41059 is a high public vulnerability record for oauth2 proxy project oauth2 proxy. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether oauth2 proxy project oauth2 proxy is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: oauth2 proxy project/oauth2 proxy. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 8.2. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-288. Sources contributing to this record: cve_org, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
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
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
Affected
- cpe oauth2 proxy project/oauth2 proxyversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-41059
Official CVE identifier
cve.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