CVE-2026-41427: Better Auth is an authentication and authorization library for TypeScript

Q: How do I fix CVE-2026-41427?

better-auth\/oauth-provider: upgrade to 1.6.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-41427 being exploited?

CVE-2026-41427 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-41427 affect?

CVE-2026-41427 affects better-auth\/oauth-provider. Severity is medium (CVSS 6.5). Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.5, the clientPrivileges option documents a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients.

Q: How urgent is CVE-2026-41427?

Priority 26/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2026-41427 is a medium-severity flaw (CVSS 6.5) affecting better-auth\/oauth-provider. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.5, the clientPrivileges option documents a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients. Deployments that configured clientPrivileges to restrict client registration were not actually restricted — any authenticated user could reach the create endpoints and register an OAuth client with attacker-ch

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-863
Published	2026-04-24
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: better-auth

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-24 20:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

better-auth better-auth\/oauth-provider UPGRADE

Affected: >= 1.4.9 and < 1.6.5 · 1.4.8 · 1.4.8 beta7 · 1.7.0 beta0

Fixed in: 1.6.5

Safe to downgrade to: a release before 1.4.8

1. Check installed version

npm ls better-authoauth-provider

2. UPGRADE to 1.6.5

npm install better-authoauth-provider@">=1.6.5"

3. If no update is available yet, DOWNGRADE to a release before 1.4.8

npm view better-authoauth-provider versions npm install better-authoauth-provider@"<1.4.8"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-41427?

better-auth\/oauth-provider: upgrade to 1.6.5. Exact commands for each OS are on this page.

Is CVE-2026-41427 being exploited?

CVE-2026-41427 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-41427 affect?

CVE-2026-41427 affects better-auth\/oauth-provider. Severity is medium (CVSS 6.5). Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.5, the clientPrivileges option documents a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients.

How urgent is CVE-2026-41427?

Priority 26/100. No elevated risk signals yet.

Related CVEs

CVE-2026-53518 HIGH 8.1 UPGRADE UPGRADE Better Auth is an authentication and authorization library for TypeScript
CVE-2026-53517 HIGH 8.1 UPGRADE UPGRADE Better Auth is an authentication and authorization library for TypeScript

References

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