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CVE-2026-67333

better-auth before 1.6.13 (and pre-release builds 1.7.0-beta.0 through 1.7.0-beta.3) fail to validate the scheme of redirect_uris registered via the deprecated oidc-provider plugin and the mcp plugin (which wraps the same provider). An attacker can register an OAuth client with a javascript: redirect_uri, which the authorization server later returns unchanged in the consent response. If the deployment's consent page navigates the browser to the returned redirectURI (e.g. assigning it to window.l
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:9f1985c0a6200f5777ed949351c80232970af45872e3a7f0d9869a1fd9c745f1
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"unaffected","packageURL":"pkg:npm/better-auth","product":"better-auth","vendor":"better-auth","versions":[{"lessThan":"1.6.13","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"1.6.13","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b1f900e18bf59f9568c51737b319b5c94b4f2002fe48c620e6e5298aec57c3d7 · sha256:cd0d6f14da8d337a… · /containers/cna/affected/0

{"defaultStatus":"unaffected","packageURL":"pkg:npm/better-auth","product":"better-auth","vendor":"better-auth","versions":[{"lessThan":"1.7.0-beta.4","status":"affected","version":"1.7.0-beta.0","versionType":"semver"},{"status":"unaffected","version":"1.7.0-beta.4","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b1f900e18bf59f9568c51737b319b5c94b4f2002fe48c620e6e5298aec57c3d7 · sha256:cd0d6f14da8d337a… · /containers/cna/affected/1
cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.2,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b1f900e18bf59f9568c51737b319b5c94b4f2002fe48c620e6e5298aec57c3d7 · sha256:cd0d6f14da8d337a… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.1,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact"…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b1f900e18bf59f9568c51737b319b5c94b4f2002fe48c620e6e5298aec57c3d7 · sha256:cd0d6f14da8d337a… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

2 source assertions
{"defaultStatus":"unaffected","packageURL":"pkg:npm/better-auth","product":"better-auth","vendor":"better-auth","versions":[{"lessThan":"1.6.13","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"1.6.13","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b1f900e18bf59f9568c51737b319b5c94b4f2002fe48c620e6e5298aec57c3d7 · sha256:cd0d6f14da8d337a… · /containers/cna/affected/0
{"defaultStatus":"unaffected","packageURL":"pkg:npm/better-auth","product":"better-auth","vendor":"better-auth","versions":[{"lessThan":"1.7.0-beta.4","status":"affected","version":"1.7.0-beta.0","versionType":"semver"},{"status":"unaffected","version":"1.7.0-beta.4","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b1f900e18bf59f9568c51737b319b5c94b4f2002fe48c620e6e5298aec57c3d7 · sha256:cd0d6f14da8d337a… · /containers/cna/affected/1

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.2,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b1f900e18bf59f9568c51737b319b5c94b4f2002fe48c620e6e5298aec57c3d7 · sha256:cd0d6f14da8d337a… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.1,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b1f900e18bf59f9568c51737b319b5c94b4f2002fe48c620e6e5298aec57c3d7 · sha256:cd0d6f14da8d337a… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-79","description":"Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b1f900e18bf59f9568c51737b319b5c94b4f2002fe48c620e6e5298aec57c3d7 · sha256:cd0d6f14da8d337a… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"GitHub Security Advisory (GHSA-86j7-9j95-vpqj)","tags":["vendor-advisory"],"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-86j7-9j95-vpqj"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b1f900e18bf59f9568c51737b319b5c94b4f2002fe48c620e6e5298aec57c3d7 · sha256:cd0d6f14da8d337a… · /containers/cna/references/0
{"name":"VulnCheck Advisory: better-auth before 1.6.13 Stored XSS via javascript redirect_uri","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/better-auth-before-stored-xss-via-javascript-redirect-uri"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b1f900e18bf59f9568c51737b319b5c94b4f2002fe48c620e6e5298aec57c3d7 · sha256:cd0d6f14da8d337a… · /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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