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CVE-2026-53513

Better-auth Better Auth server-side request forgery (SSRF)

9.6 CRITICALEPSS 0.25%
  1. Published15 Jul 2026

Description

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 forgery and possible account linking when trustEmailVerified: true is configured. This issue is fixed in version 1.6.11.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Affected products

Better-auth Better Auth≥ 0.1.0 < 1.6.11
Better-auth Better-auth/sso< 1.6.11

Remediation

Fixed in
Better-auth Better Auth≥ 1.6.11
Better-auth Better-auth/sso≥ 1.6.11

References

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Frequently asked

Is CVE-2026-53513 being actively exploited?

CVE-2026-53513 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.25%.

How severe is CVE-2026-53513?

CVE-2026-53513 has a CVSS 3.1 base score of 9.6, rated critical. EPSS estimates a 0.25% probability of exploitation.

Which products are affected by CVE-2026-53513?

Affected products include Better-auth Better Auth, Better-auth Better-auth/sso.

How do I fix CVE-2026-53513?

Upgrade affected software to a fixed version, for example Better-auth Better Auth 1.6.11, Better-auth Better-auth/sso 1.6.11 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-53513 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.