Open Redirect in Signoz
CVE-2026-63094
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (17.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Signoz — versions 253ca7dd7eb4f7a32a694c249eb0d5d0804d5619, 0
Weakness classification (CWE)
References
- github.com/SigNoz/signoz/issues/11746 (technical-description, exploit)
- github.com/SigNoz/signoz/pull/11844 (issue-tracking)
- www.vulncheck.com/advisories/signoz-sso-oauth-state-manipulation-session-token-… (third-party-advisory)
- github.com/SigNoz/signoz/commit/253ca7dd7eb4f7a32a694c249eb0d5d0804d5619 (patch)
- github.com/SigNoz/signoz/pull/12172 (issue-tracking)
- github.com/SigNoz/signoz/releases/tag/v0.134.0 (release-notes)
Frequently asked questions
- What is CVE-2026-63094?
- CVE-2026-63094 is a high-severity vulnerability in Signoz, classified under Insufficient Verification of Data Authenticity. CVSS score: 8.1/10. Published 2026-07-17.
- How severe is CVE-2026-63094?
- High severity. CVSS v3 base score is 8.1 out of 10.