Live Exposure Defense: From CVE to Confirmed Exposure in 12 Hours – See more

Back
New CVE Detected

CVE-2026-63094 – Open Redirect Enables Session Token Theft – SigNoz through 0.133.0

Be the first to know when new zero-days emerge:

Subscribe to Email Alerts
Subscribe to RSS Feed

Summary

CVE-2026-63094 is a high-severity open redirect vulnerability (CWE-601) in SigNoz, an open-source, OpenTelemetry-native observability platform, affecting all versions through 0.133.0. The flaw resides in the SSO authentication flow and allows unauthenticated remote attackers to steal victims’ access and refresh tokens by delivering a crafted login URL, enabling full account takeover on any instance configured with Google OAuth, SAML, or OIDC. The vulnerability carries a CVSS v3.1 score of 8.1 (HIGH).

Technical details

  • Root cause: The GET /api/v2/sessions/context endpoint accepts a ref parameter without validation or cryptographic binding. The application embeds this attacker-supplied value directly into the OAuth state, and after a successful SSO login the server appends the victim’s access and refresh tokens to a redirect to that URL.
  • Trigger conditions: The instance must have SSO configured — Google OAuth (available in all editions including Community), SAML, or OIDC (available in Cloud and Enterprise Self-Hosted editions). SSO is a non-default, operator-configured feature.
  • Attack vector: An unauthenticated attacker calls the /api/v2/sessions/context endpoint with ref set to an attacker-controlled host, obtaining a fully-formed crafted login URL. The attacker delivers this URL to a target user (e.g., via phishing). When the victim completes SSO authentication normally, the server redirects their browser to the attacker’s domain and appends the session credentials as URL parameters.
  • Impact: Complete theft of the victim’s access and refresh tokens, enabling the attacker to hijack the victim’s SigNoz session and perform any action the victim is authorized to perform — including accessing telemetry data, alert rules, dashboards, and administrative settings. The CVSS v4.0 vector reflects high confidentiality and integrity impact on the victim account (VC:H/VI:H).

Affected software

  • SigNoz (signoz): all versions from 0 through 0.133.0 (inclusive)
    • Community Edition: Google OAuth SSO is available and affected
    • SigNoz Cloud and Enterprise Self-Hosted: Google OAuth, SAML, and OIDC are all affected

Severity

  • CVSS v3.1 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
  • CVSS v4.0 Score: 7.6 (HIGH)
    • Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • No patched release is currently available. As of July 17, 2026, version 0.133.0 is the latest release and remains vulnerable. A fix (PR #11844) implementing allowlist validation of the ref parameter and HMAC-SHA256 signing of OAuth state is under review in the SigNoz repository.
  • Immediate workaround — disable or restrict SSO: If SSO is not operationally required, disable it in Organization Settings until a patched version is available. This eliminates the attack surface entirely.
  • Network-level control: Restrict access to the /api/v2/sessions/context endpoint at the network perimeter or reverse proxy layer so it is not reachable from untrusted networks.
  • User awareness: Alert users on SSO-enabled instances to treat any unexpected SigNoz login link with suspicion, particularly links received via email or messaging platforms.
  • Monitor for patch: Track the SigNoz GitHub repository and changelog for a release that includes the fix from PR #11844. Upgrade immediately upon release.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

Are you exposed?

Get a free report of your organization’s exposure to this CVE and threat

  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
Get Exposure Report

How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

Are you exposed?

Get a free report of your organization’s exposure to this CVE and threat

  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
Get Exposure Report
Close

Subscribe to Threat Center RSS

Copy/paste the link below into your preferred RSS reader or follow these instructions to subscribe to Slack alerts.

Open RSS feedSlack setup instructions

Close

Get Real-Time CVE Alerts to Your Email

Be the first to know when new zero-days emerge