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CVE-2025-71401

better-auth (npm) before 1.4.2 allows an external request to configure baseURL when it is not otherwise defined (e.g., BETTER_AUTH_URL is unset). An attacker able to make the very first request to the server after startup can poison the router's base path, causing all routes to return 404 for all users (denial of service). The issue is not reachable when baseURL is explicitly configured or on typical managed hosting platforms.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:87abd3809b3053040f424d0bcd5f4bed6fdba1b3f9e7559a1e1723cd3e7d3e7c
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":9.3,"baseSeverity":"CRITICAL","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d7b5d078a6e962c9fb9999de016d77c20ee1f478f6d5c516bada6abf506e3ffe · sha256:64b3a57140d05cef… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d7b5d078a6e962c9fb9999de016d77c20ee1f478f6d5c516bada6abf506e3ffe · sha256:64b3a57140d05cef… · /containers/cna/metrics/1/cvssV3_1

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:npm/better-auth","product":"better-auth","vendor":"better-auth","versions":[{"lessThan":"1.4.2","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"1.4.2","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d7b5d078a6e962c9fb9999de016d77c20ee1f478f6d5c516bada6abf506e3ffe · sha256:64b3a57140d05cef… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":9.3,"baseSeverity":"CRITICAL","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d7b5d078a6e962c9fb9999de016d77c20ee1f478f6d5c516bada6abf506e3ffe · sha256:64b3a57140d05cef… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d7b5d078a6e962c9fb9999de016d77c20ee1f478f6d5c516bada6abf506e3ffe · sha256:64b3a57140d05cef… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-770","description":"Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d7b5d078a6e962c9fb9999de016d77c20ee1f478f6d5c516bada6abf506e3ffe · sha256:64b3a57140d05cef… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"GitHub Security Advisory (GHSA-569q-mpph-wgww)","tags":["vendor-advisory"],"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-569q-mpph-wgww"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d7b5d078a6e962c9fb9999de016d77c20ee1f478f6d5c516bada6abf506e3ffe · sha256:64b3a57140d05cef… · /containers/cna/references/0
{"name":"VulnCheck Advisory: better-auth before 1.4.1 basePath Modification DoS","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/better-auth-before-basepath-modification-dos"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d7b5d078a6e962c9fb9999de016d77c20ee1f478f6d5c516bada6abf506e3ffe · sha256:64b3a57140d05cef… · /containers/cna/references/1

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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