CVE-2026-63094Public exploitNetwork attack vector

Session token theft via unvalidated SSO redirect

Published Jul 17, 2026 · Updated Jul 17, 2026

Open redirect in SigNoz before 0.134.0 allows remote attackers to steal SSO session tokens through a crafted login URL. GET /api/v2/sessions/context embeds the unauthenticated ref URL into OAuth or SAML state, then callbacks append access and refresh tokens without validating the redirect origin. Google OAuth, SAML, or OIDC must be enabled and a victim must complete SSO through the attacker-supplied URL; the stolen tokens grant that victim's session access.

CVSS severity7.6
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Open redirect in SigNoz before 0.134.0 allows remote attackers to steal SSO session tokens through a crafted login URL. GET /api/v2/sessions/context embeds the unauthenticated ref URL into OAuth or SAML state, then callbacks append access and refresh tokens without validating the redirect origin. Google OAuth, SAML, or OIDC must be enabled and a victim must complete SSO through the attacker-supplied URL; the stolen tokens grant that victim's session access.

The record

CVE
CVE-2026-63094
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
SigNoz
Product
SigNoz
Classifications
CWE-345, CWE-601, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=0.133.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SigNoz · SigNozversion=0 <=0.133.0

Published CVSS scores

8.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
7.6VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1539Steal Web Session Cookie

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo