CVE-2026-63094: Signoz

High severity, CVSS 8.1. EPSS: 0.3% chance of exploitation in the next 30 days.

SigNoz before 0.134.0 contains an open redirect vulnerability in the SSO authentication flow that allows unauthenticated attackers to steal session tokens from any user on instances configured with Google OAuth, SAML, or OIDC. Attackers can call the unauthenticated sessions context endpoint with a ref parameter pointing to an attacker-controlled host, deliver the resulting crafted login URL to a victim, and receive the victim's access and refresh tokens when they complete SSO authentication.

Affected products

• Signoz Signoz: before 0.134.0 (fixed in 0.134.0)

Published 2026-07-17. Last modified 2026-07-27.