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CVE-2026-9495

Versions of the package @koa/router from 14.0.0 and before 15.0.0 are vulnerable to Access Control Bypass due to the middleware being silently dropped from the execution chain when the router prefix contains path parameters. Depending on what the skipped middleware was supposed to protect, an attacker could bypass authentication and authorization, evade rate limiting or bypass input sanitization.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8287aa70ef878e54aa1ab3d330bd934ea2e655bff77a6669ece5c01a5e925897
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","exploitMaturity":"PROOF_OF_CONCEPT","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:0f185b06a8e0298cc451babe1971ddc963f50945b0397281c12ca490b7874e22 · sha256:f0785990ebcbaa16… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"LOW","exploitCodeMaturity":"PROOF_OF_CONCEPT","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:0f185b06a8e0298cc451babe1971ddc963f50945b0397281c12ca490b7874e22 · sha256:f0785990ebcbaa16… · /containers/cna/metrics/0/cvssV3_1
cwe · 2 assertions

{"cweId":"CWE-284","description":"Access Control Bypass","lang":"en"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0f185b06a8e0298cc451babe1971ddc963f50945b0397281c12ca490b7874e22 · sha256:f0785990ebcbaa16… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-284","description":"CWE-284 Improper Access Control","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0f185b06a8e0298cc451babe1971ddc963f50945b0397281c12ca490b7874e22 · sha256:f0785990ebcbaa16… · /containers/adp/0/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"@koa/router","vendor":"n/a","versions":[{"lessThan":"15.0.0","status":"affected","version":"14.0.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0f185b06a8e0298cc451babe1971ddc963f50945b0397281c12ca490b7874e22 · sha256:f0785990ebcbaa16… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","exploitMaturity":"PROOF_OF_CONCEPT","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:0f185b06a8e0298cc451babe1971ddc963f50945b0397281c12ca490b7874e22 · sha256:f0785990ebcbaa16… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"LOW","exploitCodeMaturity":"PROOF_OF_CONCEPT","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:0f185b06a8e0298cc451babe1971ddc963f50945b0397281c12ca490b7874e22 · sha256:f0785990ebcbaa16… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-284","description":"Access Control Bypass","lang":"en"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0f185b06a8e0298cc451babe1971ddc963f50945b0397281c12ca490b7874e22 · sha256:f0785990ebcbaa16… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-284","description":"CWE-284 Improper Access Control","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0f185b06a8e0298cc451babe1971ddc963f50945b0397281c12ca490b7874e22 · sha256:f0785990ebcbaa16… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

5 source assertions
{"url":"https://github.com/koajs/router/commit/d53e17f284557b1f417946f9807ee52290c3c759"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0f185b06a8e0298cc451babe1971ddc963f50945b0397281c12ca490b7874e22 · sha256:f0785990ebcbaa16… · /containers/cna/references/3
{"url":"https://github.com/koajs/router/issues/202"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0f185b06a8e0298cc451babe1971ddc963f50945b0397281c12ca490b7874e22 · sha256:f0785990ebcbaa16… · /containers/cna/references/1
{"url":"https://github.com/koajs/router/pull/206"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0f185b06a8e0298cc451babe1971ddc963f50945b0397281c12ca490b7874e22 · sha256:f0785990ebcbaa16… · /containers/cna/references/2
{"tags":["exploit"],"url":"https://github.com/koajs/router/pull/206"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0f185b06a8e0298cc451babe1971ddc963f50945b0397281c12ca490b7874e22 · sha256:f0785990ebcbaa16… · /containers/adp/0/references/0
{"url":"https://security.snyk.io/vuln/SNYK-JS-KOAROUTER-12215044"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0f185b06a8e0298cc451babe1971ddc963f50945b0397281c12ca490b7874e22 · sha256:f0785990ebcbaa16… · /containers/cna/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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