Unauthenticated mock-user authentication bypass
Published Nov 20, 2023 · Updated Aug 29, 2024
Improper authorization in Auth.js NextAuth.js before 4.24.5 allows remote attackers to simulate a logged-in user via a forged session cookie. Interrupted OAuth flows issue JWTs that the default Middleware accepts when replayed as the next-auth.session-token cookie, creating an empty user identified only by a random value. Exploitation requires obtaining such an interrupted-flow JWT; the result exposes limited logged-in UI state but not other users' data or authorized resources.
Summary
What happened
Improper authorization in Auth.js NextAuth.js before 4.24.5 allows remote attackers to simulate a logged-in user via a forged session cookie. Interrupted OAuth flows issue JWTs that the default Middleware accepts when replayed as the next-auth.session-token cookie, creating an empty user identified only by a random value. Exploitation requires obtaining such an interrupted-flow JWT; the result exposes limited logged-in UI state but not other users' data or authorized resources.
The record
- CVE
- CVE-2023-48309
- Published
- Nov 20, 2023
- Updated
- Aug 29, 2024
- Vendor
- Auth.js
- Product
- NextAuth.js
- Classifications
- CWE-863, CWE-285, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 20, 2023CVE publishedPublication date reported by the CVE source.
- Aug 29, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 4.24.5
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
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo