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CVE-2026-9595

Impact: When a user-configured proxy on webpack-dev-server has a broad context (e.g. /) and ws: true, it also intercepts the dev server's own HMR WebSocket and forwards it to the proxy target. This leaks the browser's cookies and Origin header to the backend, bypasses the dev server's Host/Origin validation, and corrupts the HMR socket (both HMR and the proxy end up writing to the same socket). Patches: Fixed in webpack-dev-server@5.2.5. Workarounds: Scope user-defined proxy context to specifi
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:5c074c4817e34236aefc091e615f2a3ce063e6253dc814b19462a886587f295d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-441","description":"CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b57cd30d96b9dc32c5f8f352e2ca2125a15897a3dff765277d197f27000ea13f · sha256:7bd537255538b45c… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-346","description":"CWE-346: Origin Validation Error","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b57cd30d96b9dc32c5f8f352e2ca2125a15897a3dff765277d197f27000ea13f · sha256:7bd537255538b45c… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:npm/webpack-dev-server","product":"webpack-dev-server","vendor":"webpack-dev-server","versions":[{"lessThan":"5.2.5","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"5.2.5","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b57cd30d96b9dc32c5f8f352e2ca2125a15897a3dff765277d197f27000ea13f · sha256:7bd537255538b45c… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b57cd30d96b9dc32c5f8f352e2ca2125a15897a3dff765277d197f27000ea13f · sha256:7bd537255538b45c… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-441","description":"CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b57cd30d96b9dc32c5f8f352e2ca2125a15897a3dff765277d197f27000ea13f · sha256:7bd537255538b45c… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-346","description":"CWE-346: Origin Validation Error","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b57cd30d96b9dc32c5f8f352e2ca2125a15897a3dff765277d197f27000ea13f · sha256:7bd537255538b45c… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"url":"https://cna.openjsf.org/security-advisories.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b57cd30d96b9dc32c5f8f352e2ca2125a15897a3dff765277d197f27000ea13f · sha256:7bd537255538b45c… · /containers/cna/references/1
{"url":"https://github.com/facebook/create-react-app/pull/7444"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b57cd30d96b9dc32c5f8f352e2ca2125a15897a3dff765277d197f27000ea13f · sha256:7bd537255538b45c… · /containers/cna/references/4
{"url":"https://github.com/vuejs/vue-cli/commit/72ba7505aff2a8314e82aa5082379a77504a1fcb"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b57cd30d96b9dc32c5f8f352e2ca2125a15897a3dff765277d197f27000ea13f · sha256:7bd537255538b45c… · /containers/cna/references/3
{"url":"https://github.com/webpack/webpack-dev-server/pull/4316"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b57cd30d96b9dc32c5f8f352e2ca2125a15897a3dff765277d197f27000ea13f · sha256:7bd537255538b45c… · /containers/cna/references/2
{"url":"https://github.com/webpack/webpack-dev-server/security/advisories/GHSA-mx8g-39q3-5c79"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b57cd30d96b9dc32c5f8f352e2ca2125a15897a3dff765277d197f27000ea13f · sha256:7bd537255538b45c… · /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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