CVE-2026-110863

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Source
https://cve.org/CVERecord?id=CVE-2026-110863
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-110863.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-110863
Aliases
  • GHSA-mx9r-x6ww-qjw9
Published
2026-10-14T22:52:50Z
Modified
2026-10-15T10:47:35Z
Severity
  • 8.6 (High) CVSS_V4 - 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 CVSS Calculator
Summary
Better Auth @better-auth/sso before 1.7.3 Authentication Bypass via Personal SSO Providers
Details

Better Auth @better-auth/sso from 1.7.0-rc.2 before 1.7.3 contains an authentication bypass vulnerability that allows authenticated users to sign in as other users by registering a personal SSO provider. Attackers can copy a legitimate provider's OIDC issuer or SAML entity ID and assert a victim's subject or NameID, because account lookup ignores providerId, creating sessions for victim accounts.

Database specific 
{
    "cna_assigner":  "VulnCheck",
    "cwe_ids":  [
        "CWE-287"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110863.json"
}
References

Affected packages

Git / github.com/better-auth/better-auth

Affected ranges

Type
GIT
Repo
https://github.com/better-auth/better-auth
Events
Introduced
cc708e51bcb1d4c367d2bc6182e6fd7fd722ece8
Fixed
597d39cb4aaaac1ad729051fbdd22a63b8ba8d8d
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "1.7.0-rc.2"
        },
        {
            "fixed":  "1.7.3"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-110863.json"