# CVE-2026-121939: Databasement before 1.10.9 Account Takeover via OIDC Email Auto-Linking

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

Databasement before 1.10.9 contains an authentication bypass vulnerability in OAuthService::findOrCreateLocalUser() that links OIDC identities to local users by email without checking email_verified. Attackers can register an identity provider account with a victim's unverified email to log in as any user, including the super-admin, and retain access after password resets.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/David-Crty/databasement/commit/b7f4079c02b7ce3f1cf2844de182e809636c3382

## Affected products and versions

- David-Crty / Databasement (David-Crty/databasement): ≥ 0; < 1.10.9 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 9.2 (critical); CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-290

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/David-Crty/databasement/security/advisories/GHSA-mh6w-2cch-w8v8 (CNA: VulnCheck; vendor-advisory)

- https://github.com/David-Crty/databasement/commit/b7f4079c02b7ce3f1cf2844de182e809636c3382 (CNA: VulnCheck; patch)

- https://github.com/David-Crty/databasement/releases/tag/v1.10.9 (CNA: VulnCheck; release-notes)

- https://github.com/David-Crty/databasement/blob/v1.10.8/app/Services/OAuthService.php#L55-L68 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/databasement-before-1.10.9-account-takeover-via-oidc-email-auto-linking (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-121939; retrieved 2026-11-04; source updated 2026-11-04

Revision: f8369d2a9124c4591a47d81a506b99e8ca54421dcd071e2e2487545eac8b751c

Canonical: https://y2.dev/cve/CVE-2026-121939

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