CVE•Published 2026-07-15•Modified 2026-07-21•1 article on news•4 live references•NVD data

CVE-2026-53513Better-auth · Better-auth\/sso

Vulnerability data via NVD (ingested)

CVSS v3.1

9.6

CRITICAL

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

EPSS percentile

Exploit Prediction Scoring System · top 83% of all CVEs

Weaknesses (CWE)

CWE-20Improper Input Validation CWE-345Insufficient Verification of Data Authenticity CWE-441Unintended Proxy or Intermediary ('Confused Deputy')CWE-918Server-Side Request Forgery (SSRF)

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.

Timeline

Published 2026-07-15

Modified 2026-07-21

External references

NVD MITRE Exploit-DB VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common). Live host counts are a Premium feature.

Shodan · vuln tag

vuln:CVE-2026-53513

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Better-auth Better-auth\/sso"

All exposed Better-auth Better-auth\/sso instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Better-auth\/sso"

HTTP body or banner mentions "Better-auth\/sso" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-53513