What’s Vulnerable › Vulnerabilities

CVE-2026-63094: SigNoz < 0.134.0 SSO OAuth State Manipulation Session Token Theft

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-17 · updated 2026-07-27
• Weakness: CWE-345

Description

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: before 0.134.0 — fixed in 0.134.0

How to fix

Upgrade to a fixed version: signoz 0.134.0. Check the vendor advisory for mitigations.

References

• https://github.com/SigNoz/signoz/commit/253ca7dd7eb4f7a32a694c249eb0d5d0804d5619
• https://github.com/SigNoz/signoz/issues/11746
• https://github.com/SigNoz/signoz/pull/12172
• https://github.com/SigNoz/signoz/releases/tag/v0.134.0
• https://www.vulncheck.com/advisories/signoz-sso-oauth-state-manipulation-session-token-theft

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