@better-auth/scim: Account/provider takeover via missing owner binding on non-org SCIM providers

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

EPSS

• CVE-2026-67331: 0.39% estimated exploitation activity in the next 30 days; percentile 33.00 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Am I affected? Users are affected if all of these hold: - They install and register the @better-auth/scim plugin (plugins: [scim()]). - They create SCIM providers without an organizationId, that is, non-organization ("personal") providers. Organization-scoped providers are not affected because they enforce organization membership and role. - Their application's deployment has more than one authenticated user, so one account can target another user's provider. - They have not set providerOwnership: { enabled: true }. The SCIM management endpoints first shipped in 1.5.0, so every stable release from 1.5.0 onward is affected, and the stable line is not patched. On the pre-release line, builds through 1.7.0-beta.3 are affected, and 1.7.0-beta.4 carries the fix. Fix: 1. Upgrade to @better-auth/scim@1.7.0-beta.4 (then 1.7.0). This is a breaking change: it removes the providerOwnership option, makes owner binding mandatory, and adds a permanent scimProvider.userId column. 2. Run the schema…

Published by the source

7 Jul 2026, 20:57 UTC

Last modified by the source

10 Sep 2026, 03:50 UTC

Source last checked

26 Oct 2026, 12:56 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-j8v8-g9cx-5qf4

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-j8v8-g9cx-5qf4

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# Patch Next advisory brief: CVE-2026-67331

Advisory: @better-auth/scim: Account/provider takeover via missing owner binding on non-org SCIM providers
IDs: CVE-2026-67331, GHSA-j8v8-g9cx-5qf4
Record: https://patchnext.com/advisories/cve-2026-67331 (revision 2, source checked 26 Oct 2026, 12:56 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @better-auth/scim 1.7.0-beta.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @better-auth/scim: affected >= 1.5.0, < 1.7.0-beta.4; fixed in 1.7.0-beta.4

## Suggested inspection (read-only)
- `npm ls @better-auth/scim --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @better-auth/scim.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-j8v8-g9cx-5qf4 (OSV record GHSA-j8v8-g9cx-5qf4 lists affected ranges: npm @better-auth/scim >=1.5.0 <1.7.0-beta.4 (fixed))
- Verified: https://github.com/advisories/GHSA-j8v8-g9cx-5qf4 (GitHub-reviewed advisory GHSA-j8v8-g9cx-5qf4 lists affected ranges: npm @better-auth/scim >=1.5.0 <1.7.0-beta.4)

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