Authenticated SSRF via persisted unvalidated OIDC endpoints
Published Jul 15, 2026 · Updated Jul 15, 2026
SSRF in Better Auth SSO Plugin before 1.6.11 allows remote authenticated users to read internal HTTP responses through crafted OIDC URLs. The registration and provider-update routes persist attacker-supplied token, userInfo, and JWKS endpoints without origin validation, then fetch them during an OIDC callback. Any valid session reaches the default registration gate; enabling trustEmailVerified also permits malicious user information to link an existing account.
Summary
What happened
SSRF in Better Auth SSO Plugin before 1.6.11 allows remote authenticated users to read internal HTTP responses through crafted OIDC URLs. The registration and provider-update routes persist attacker-supplied token, userInfo, and JWKS endpoints without origin validation, then fetch them during an OIDC callback. Any valid session reaches the default registration gate; enabling trustEmailVerified also permits malicious user information to link an existing account.
The record
- CVE
- CVE-2026-53513
- Published
- Jul 15, 2026
- Updated
- Jul 15, 2026
- Vendor
- Better Auth
- Product
- Better Auth
- Classifications
- CWE-441, CWE-345, CWE-20, CWE-918, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 15, 2026CVE publishedPublication date reported by the CVE source.
- Jul 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 0.1.0, < 1.6.11
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- SecureLayer7 CVE-2026-53513 proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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