CVE-2026-53513: Better Auth is an authentication and authorization library for TypeScript

Q: How do I fix CVE-2026-53513?

better-auth\/sso: upgrade to 1.6.11; better auth: upgrade to 1.6.11. Exact commands for each OS are on this page.

Q: Is CVE-2026-53513 being exploited?

CVE-2026-53513 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-2026-53513 affect?

CVE-2026-53513 affects better-auth\/sso, better auth. Severity is critical (CVSS 9.6). Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tok

Q: How urgent is CVE-2026-53513?

Priority 38/100. Critical severity

This month

CRITICAL 9.6UPGRADEUPGRADE

CVE-2026-53513 is a critical-severity flaw (CVSS 9.6) affecting better-auth\/sso, better auth. 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 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tokenEndpoint, and jwksEndpoint URLs when skipDiscovery: true is set, store them on the ssoProvider row without origin validation, and fetch them during OIDC callback, allowing non-blind server-side request forger

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-20, CWE-345, CWE-441, CWE-918
Published	2026-07-15
Last modified	2026-07-21

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

Last updated 2026-07-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-15 18:16 UTCPublished CVE record published
2026-07-21 15:39 UTCUpdated Record last modified

better-auth better-auth\/sso UPGRADE

Affected: < 1.6.11

Fixed in: 1.6.11

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls better-authsso

2. UPGRADE to 1.6.11

npm install better-authsso@">=1.6.11"

better-auth better auth UPGRADE

Affected: >= 0.1.0 and < 1.6.11

Fixed in: 1.6.11

Safe to downgrade to: a release before 0.1.0

1. Check installed version

npm ls better-auth

2. UPGRADE to 1.6.11

npm install better-auth@">=1.6.11"

3. If no update is available yet, DOWNGRADE to a release before 0.1.0

npm view better-auth versions npm install better-auth@"<0.1.0"

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-2026-53513?

better-auth\/sso: upgrade to 1.6.11; better auth: upgrade to 1.6.11. Exact commands for each OS are on this page.

Is CVE-2026-53513 being exploited?

CVE-2026-53513 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-2026-53513 affect?

CVE-2026-53513 affects better-auth\/sso, better auth. Severity is critical (CVSS 9.6). Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tok

How urgent is CVE-2026-53513?

Priority 38/100. Critical severity

Related CVEs

CVE-2026-53515 HIGH 7.1 UPGRADE UPGRADE Better Auth is an authentication and authorization library for TypeScript

References

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