CVE-2026-63094

HIGH 8.1

SigNoz 0.133.0 SSO OAuth State Manipulation Session Token Theft

CVSS Score

8.1

EPSS Score

0.0%

EPSS Percentile

0th

SigNoz through 0.133.0 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.

CWE	CWE-601 CWE-345
Vendor	signoz
Product	signoz
Published	Jul 17, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

SigNoz / signoz

0 ≤ 0.133.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/SigNoz/signoz/issues/11746 github.com: https://github.com/SigNoz/signoz/pull/11844 vulncheck.com: https://www.vulncheck.com/advisories/signoz-sso-oauth-state-manipulation-session-token-theft

Credits

George Chen