Authorizer before 2.4.2 Password Reset Poisoning via x-authorizer-url gRPC metadata

Advisories

Authorizer before 2.4.2 Password Reset Poisoning via x-authorizer-url gRPC metadata

Severity: high
Date: 11/5/2026
Affecting: authorizer >= 2.3.0-rc.3, < 2.4.2
CVE: CVE-2026-123196
CWE: CWE-640 Weak Password Recovery Mechanism for Forgotten Password
CVSS: 8.6
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
References: GitHub Security Advisory (GHSA-m46m-j9p5-5j99)
https://github.com/authorizerdev/authorizer/pull/814
https://github.com/authorizerdev/authorizer/commit/b5012cbcdc7c32dcb4bd43179a212055e7fcb863
authorizer 2.4.2 Release Notes
https://github.com/authorizerdev/authorizer/blob/0bceb94f0ab726d9c396202f4d8fbedee1dc9cab/internal/grpcsrv/transport/grpc_metadata.go#L40
https://github.com/authorizerdev/authorizer/blob/0bceb94f0ab726d9c396202f4d8fbedee1dc9cab/internal/gateway/mount.go#L244-L248
Credit: Theodoros Lampropoulos, Lakhan Samani (lakhansamani)
Description: Authorizer before 2.4.2 contains a password reset poisoning vulnerability that allows unauthenticated attackers to control emailed link hosts by supplying x-authorizer-url gRPC metadata. Attackers can send this metadata to the gRPC port or a Grpc-Metadata-X-Authorizer-Url header through the REST gateway to capture reset or magic-link tokens and take over accounts.

Ready to get Started?

Explore VulnCheck, a next-generation Cyber Threat Intelligence platform, which provides exploit and vulnerability intelligence to help you prioritize and remediate vulnerabilities that matter.

Vulnerability Prioritization
Prioritize vulnerabilities that matter based on the threat landscape and defer vulnerabilities that don't.
Early Warning System
Real-time alerting of changes in the vulnerability landscape so that you can take action before the attacks start.

Schedule a Demo