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CVE-2026-40575

A flaw was found in OAuth2 Proxy. When configured with `--reverse-proxy` and either `--skip-auth-regex` or `--skip-auth-route`, the proxy may trust a client-supplied `X-Forwarded-Uri` header. An unauthenticated remote attacker can exploit this by spoofing the header, leading to an authentication bypass. This allows unauthorized access to protected routes without a valid session.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:a73411be4ec73f97ce4bd3cbca41dabfb923adabba2c2930b9d3524822de3f28
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
3

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"oauth2-proxy","vendor":"oauth2-proxy","versions":[{"status":"affected","version":">= 7.5.0, < 7.15.2"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/cna/affected/0

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:ceph_storage:9"],"defaultStatus":"affected","packageName":"rhceph/oauth2-proxy-rhel9","product":"Red Hat Ceph Storage 9","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/adp/1/affected/0
cvss · 2 assertions

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/adp/1/metrics/1/cvssV3_1

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/cna/metrics/0/cvssV3_1
cwe · 2 assertions

{"cweId":"CWE-290","description":"Authentication Bypass by Spoofing","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/adp/1/problemTypes/0/descriptions/0

{"cweId":"CWE-290","description":"CWE-290: Authentication Bypass by Spoofing","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

2 source assertions
{"product":"oauth2-proxy","vendor":"oauth2-proxy","versions":[{"status":"affected","version":">= 7.5.0, < 7.15.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/cna/affected/0
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:ceph_storage:9"],"defaultStatus":"affected","packageName":"rhceph/oauth2-proxy-rhel9","product":"Red Hat Ceph Storage 9","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/adp/1/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/adp/1/metrics/1/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-290","description":"Authentication Bypass by Spoofing","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/adp/1/problemTypes/0/descriptions/0
{"cweId":"CWE-290","description":"CWE-290: Authentication Bypass by Spoofing","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-40575"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/adp/1/references/0
{"name":"RHBZ#2460449","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2460449"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/adp/1/references/1
{"name":"https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-7x63-xv5r-3p2x","tags":["x_refsource_CONFIRM"],"url":"https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-7x63-xv5r-3p2x"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/cna/references/0
{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40575.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:44ffe9f8d86ef624c4b7969ed8ddd33006bb4646f7f2ff23f31e78f6dbcd75dd · sha256:a183a3e93eb870a0… · /containers/adp/1/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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