OIDC session impersonation via unchecked JWT signer
Published Oct 21, 2024 · Updated Oct 14, 2025
Authentication bypass in Amazon Application Load Balancer Identity ASP.NET Core Middleware allows remote attackers to impersonate OIDC sessions. ALBIdentityMiddleware.GetUser disables issuer validation and never compares the JWT signer with the expected ALB ARN before accepting its claims. Exploitation requires an internet-reachable ALB target and a JWT signed by another load balancer, granting the forged session the token's claims.
Summary
What happened
Authentication bypass in Amazon Application Load Balancer Identity ASP.NET Core Middleware allows remote attackers to impersonate OIDC sessions. ALBIdentityMiddleware.GetUser disables issuer validation and never compares the JWT signer with the expected ALB ARN before accepting its claims. Exploitation requires an internet-reachable ALB target and a JWT signed by another load balancer, granting the forged session the token's claims.
The record
- CVE
- CVE-2024-10125
- Published
- Oct 21, 2024
- Updated
- Oct 14, 2025
- Vendor
- Amazon Web Services
- Product
- Amazon Application Load Balancer Identity ASP.NET Core Middleware
- Classifications
- CWE-290
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 21, 2024CVE publishedPublication date reported by the CVE source.
- Oct 14, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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- Affected versionversion=all
What conditions does exploitation require?
What is affected?
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
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