{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/74793?format=json","vulnerability_id":"VCID-5yp4-j6jn-3kcf","summary":"OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Versions prior to 7.15.2 contain a configuration-dependent authentication bypass in deployments where OAuth2 Proxy is used with an auth_request-style integration (such as nginx auth_request) and either --ping-user-agent is set or --gcp-healthchecks is enabled. In affected configurations, OAuth2 Proxy treats any request with the configured health check User-Agent value as a successful health check regardless of the requested path, allowing an unauthenticated remote attacker to bypass authentication and access protected upstream resources. Deployments that do not use auth_request-style subrequests or that do not enable --ping-user-agent/--gcp-healthchecks are not affected. This issue is fixed in 7.15.2.","aliases":[{"alias":"CVE-2026-34457"},{"alias":"GHSA-5hvv-m4w4-gf6v"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/373423?format=json","purl":"pkg:golang/github.com/oauth2-proxy/oauth2-proxy/v7@7.15.2","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:golang/github.com/oauth2-proxy/oauth2-proxy/v7@7.15.2"}],"affected_packages":[],"references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2026-34457","reference_id":"","reference_type":"","scores":[{"value":"0.00039","scoring_system":"epss","scoring_elements":"0.12201","published_at":"2026-06-11T12:55:00Z"},{"value":"0.00039","scoring_system":"epss","scoring_elements":"0.12295","published_at":"2026-06-12T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-34457"},{"reference_url":"https://github.com/oauth2-proxy/oauth2-proxy","reference_id":"","reference_type":"","scores":[{"value":"9.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/oauth2-proxy/oauth2-proxy"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34457","reference_id":"","reference_type":"","scores":[{"value":"9.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34457"},{"reference_url":"https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-5hvv-m4w4-gf6v","reference_id":"GHSA-5hvv-m4w4-gf6v","reference_type":"","scores":[{"value":"9.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-04-15T17:43:23Z/"}],"url":"https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-5hvv-m4w4-gf6v"},{"reference_url":"https://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.15.2","reference_id":"v7.15.2","reference_type":"","scores":[{"value":"9.1","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:T/P:M/B:A/M:M/D:T/2026-04-15T17:43:23Z/"}],"url":"https://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.15.2"}],"weaknesses":[{"cwe_id":290,"name":"Authentication Bypass by Spoofing","description":"This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks."}],"exploits":[],"severity_range_score":"9.0 - 10.0","exploitability":null,"weighted_severity":null,"risk_score":null,"resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-5yp4-j6jn-3kcf"}