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CVE-2026-67328

@better-auth/sso versions before 1.6.21 contain multiple authentication bypass vulnerabilities in SSO provider handling that allow attackers to sign in as arbitrary users. Attackers can exploit domain verification parsing mismatches, orphaned provider accounts, unbound SAML assertions, or reflected XSS on logout endpoints to gain unauthorized session access and account takeover.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:53a49d17c871a0867ebdb20d53fd907aee33c2af8ab31b857a2cb33c07424dfa
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/sso","product":"sso","vendor":"better-auth","versions":[{"lessThan":"1.6.21","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"1.6.21","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5201473bc3bd56e2cd5a4d42e33f10dac7ae68e1ecdc364a752e3cfb1949a6a8 · sha256:9eee5e0db81ec478… · /containers/cna/affected/0

{"defaultStatus":"unaffected","packageURL":"pkg:npm/better-auth/sso","product":"sso","vendor":"better-auth","versions":[{"lessThan":"1.7.0-beta.10","status":"affected","version":"1.7.0-beta.0","versionType":"semver"},{"status":"unaffected","version":"1.7.0-beta.10","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5201473bc3bd56e2cd5a4d42e33f10dac7ae68e1ecdc364a752e3cfb1949a6a8 · sha256:9eee5e0db81ec478… · /containers/cna/affected/1
cvss · 2 assertions

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5201473bc3bd56e2cd5a4d42e33f10dac7ae68e1ecdc364a752e3cfb1949a6a8 · sha256:9eee5e0db81ec478… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.6,"baseSeverity":"HIGH","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5201473bc3bd56e2cd5a4d42e33f10dac7ae68e1ecdc364a752e3cfb1949a6a8 · sha256:9eee5e0db81ec478… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

2 source assertions
{"defaultStatus":"unaffected","packageURL":"pkg:npm/better-auth/sso","product":"sso","vendor":"better-auth","versions":[{"lessThan":"1.6.21","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"1.6.21","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5201473bc3bd56e2cd5a4d42e33f10dac7ae68e1ecdc364a752e3cfb1949a6a8 · sha256:9eee5e0db81ec478… · /containers/cna/affected/0
{"defaultStatus":"unaffected","packageURL":"pkg:npm/better-auth/sso","product":"sso","vendor":"better-auth","versions":[{"lessThan":"1.7.0-beta.10","status":"affected","version":"1.7.0-beta.0","versionType":"semver"},{"status":"unaffected","version":"1.7.0-beta.10","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5201473bc3bd56e2cd5a4d42e33f10dac7ae68e1ecdc364a752e3cfb1949a6a8 · sha256:9eee5e0db81ec478… · /containers/cna/affected/1

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5201473bc3bd56e2cd5a4d42e33f10dac7ae68e1ecdc364a752e3cfb1949a6a8 · sha256:9eee5e0db81ec478… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.6,"baseSeverity":"HIGH","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5201473bc3bd56e2cd5a4d42e33f10dac7ae68e1ecdc364a752e3cfb1949a6a8 · sha256:9eee5e0db81ec478… · /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:v2:5201473bc3bd56e2cd5a4d42e33f10dac7ae68e1ecdc364a752e3cfb1949a6a8 · sha256:9eee5e0db81ec478… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"GitHub Security Advisory (GHSA-prpr-5gj3-qqhg)","tags":["vendor-advisory"],"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-prpr-5gj3-qqhg"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5201473bc3bd56e2cd5a4d42e33f10dac7ae68e1ecdc364a752e3cfb1949a6a8 · sha256:9eee5e0db81ec478… · /containers/cna/references/0
{"name":"VulnCheck Advisory: @better-auth/sso before 1.6.21 Account Takeover via SSO","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/better-auth-sso-before-account-takeover-via-sso"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5201473bc3bd56e2cd5a4d42e33f10dac7ae68e1ecdc364a752e3cfb1949a6a8 · sha256:9eee5e0db81ec478… · /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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