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CVE-2026-6657

A vulnerability in jupyter-server versions 1.12.0 through 2.17.0 allows an attacker to bypass CORS origin validation when the `allow_origin_pat` configuration is used. The issue arises from the use of `re.match()` for validating the `Origin` header, which only anchors at the start of the string. This allows attacker-controlled domains such as `trusted.example.com.evil.com` to pass validation against patterns intended to match `trusted.example.com`. The vulnerability affects multiple locations in
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:13c38794c952469815e87dd2aa945db38b92f981a5aa892d60e4d5ae9288d0fc
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"jupyter/jupyter","vendor":"jupyter","versions":[{"lessThanOrEqual":"latest","status":"affected","version":"unspecified","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c1c1609c95654545ac2581a0bf13eb93eaf107e7fca71d82492a91031b57679e · sha256:5b0870f820a020f5… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.0"},"metric_type":"cvssV3_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c1c1609c95654545ac2581a0bf13eb93eaf107e7fca71d82492a91031b57679e · sha256:5b0870f820a020f5… · /containers/cna/metrics/0/cvssV3_0

CWE assertions

1 source assertion
{"cweId":"CWE-346","description":"CWE-346 Origin Validation Error","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c1c1609c95654545ac2581a0bf13eb93eaf107e7fca71d82492a91031b57679e · sha256:5b0870f820a020f5… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"url":"https://huntr.com/bounties/18f642db-3569-43b3-b58d-ff97be4b09d7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c1c1609c95654545ac2581a0bf13eb93eaf107e7fca71d82492a91031b57679e · sha256:5b0870f820a020f5… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://huntr.com/bounties/18f642db-3569-43b3-b58d-ff97be4b09d7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c1c1609c95654545ac2581a0bf13eb93eaf107e7fca71d82492a91031b57679e · sha256:5b0870f820a020f5… · /containers/adp/0/references/0

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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