External risk intelligence

OpenObserve Authentication Bypass to Remote Code Execution.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-126065

OpenObserve is a cloud-native observability platform that typically exposes web APIs and administrative interfaces to users for monitoring and management. Because the vulnerability exists within the authentication mechanism for these API routes, and observability platforms are commonly deployed as internet-facing or externally reachable services to facilitate telemetry ingestion and dashboard access, the surface is likely internet-facing.

Authentication Bypass

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This vulnerability in OpenObserve, a cloud-native observability platform, allows unauthenticated attackers to access protected API routes by exploiting a weakness in how the system handles authentication credentials. If an attacker knows a user's email and organization, they could potentially impersonate that user to gain access to sensitive telemetry data, alerts, or system configurations. In more severe scenarios, this could lead to the creation or modification of files on the system, potentially enabling remote code execution.

Unauthenticated access to system APIs.
Compromised user roles and data access.
Confirm platform relevance and exposure.

Attack Path

How an attacker could exploit the issue

An attacker can exploit this vulnerability by sending specially crafted API requests. If the attacker knows a user's email and organization, they can bypass authentication on protected API routes. This allows them to impersonate the user, gaining access to sensitive data and potentially executing arbitrary code by creating or overwriting files.

Unauthenticated access to API routes.
Malicious file creation via search API.
Data exposure, modification, and code execution.

Live Threat

Current exploitation, exposure, and threat context

An unauthenticated attacker could access protected non-ingestion API routes within OpenObserve by knowing a user's email and organization. This bypass allows them to authenticate with the victim's role and permissions, potentially exposing or modifying telemetry, alerts, streams, users, and security configurations. When supported, this vulnerability could also lead to conditional pre-authentication remote code execution by creating or overwriting files.

Telemetry, alerts, and user data at risk.
Attacker bypasses authentication using user email.
Unauthorized access and potential data modification.

Operational Fix

Recommended remediation, mitigation, and detection steps

As a cloud-native observability platform, OpenObserve's API endpoints are likely managed by platform or security teams. The first step is to identify all OpenObserve deployments, assess their network exposure and business criticality, and then confirm the accountable owner for each instance to prioritize remediation.

Platform or Security teams own the issue.
Verify network exposure and critical systems.
Plan remediation based on risk and ownership.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Free EASM Trial See How Signal Works

Frequently asked questions

What is OpenObserve and what is it used for?

OpenObserve is a cloud-native platform designed for observability, which means it helps teams collect, store, and analyze telemetry data like logs, metrics, and traces. It provides APIs and dashboards that allow users to monitor system health, set up alerts, and manage complex infrastructure configurations.

How does CVE-2026-126065 affect authentication?

This vulnerability, classified as Improper Authentication (CWE-287), stems from how the system validates credentials. It incorrectly accepts empty or whitespace-only passwords for certain user accounts—specifically those created via SSO or migration. This allows an attacker to bypass security checks and log in as another user if they know that user's email address and organization.

Do I need to worry about this if I use password authentication?

The vulnerability is specific to accounts where the 'password_ext' field is empty or missing, which typically occurs with SSO-provisioned or migrated accounts. Simply using a standard password for a locally created account may not trigger this specific flaw. However, if your system contains any accounts in that specific state, those accounts remain susceptible to the bypass regardless of how other users log in.

Why is this CVE significant for my network security?

Halo Surface Signal indicates that OpenObserve is frequently deployed as an internet-facing service to enable external telemetry ingestion and dashboard access. Because this flaw allows attackers to impersonate users on non-ingestion API routes, it effectively removes the authentication boundary for exposed instances, potentially leading to unauthorized data modification or remote code execution.

How can I secure my environment against this threat?

The primary fix is to update your OpenObserve installation to version 1.1.0 or later. Before patching, identify all instances within your infrastructure, determine if they are reachable over the network, and verify which accounts might be in the affected state. Coordinate with your platform or security teams to prioritize these updates based on the sensitivity of the data managed by each instance.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.