External risk intelligence

Yamcs Authentication Endpoint Vulnerable to Brute-Force Attacks

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-44596

The vulnerability resides in an authentication endpoint of a mission control framework. Such services often expose API or web-based management interfaces to authorized network segments, and while not always publicly facing by default, they are commonly deployed as accessible service endpoints for operational connectivity.

Spaceapplications Yamcs

before 5.12.7

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 advisory highlights a critical vulnerability in the Yamcs mission control framework that could allow unauthorized access to user accounts through unlimited password guessing. The issue stems from a lack of security measures on the authentication endpoint, potentially exposing sensitive system operations.

Unrestricted password guessing affects authentication.
Protects critical mission control system access.
Confirm exposure and verify system integrity.

Attack Path

How an attacker could exploit the issue

An attacker could reach the vulnerable component by interacting with the authentication endpoint of the Yamcs mission control framework over the network. Without any defenses against repeated attempts, the attacker can repeatedly try different passwords for user accounts. If successful, this could lead to unauthorized access and compromise of the system.

Network access required.
Unlimited password guessing triggers.
Unauthorized access and system compromise.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability affects the authentication endpoint of the Yamcs mission control framework. Without rate limiting or account lockout mechanisms, an unauthenticated remote attacker could repeatedly attempt to guess user passwords. This significantly increases the likelihood of successful brute-force attacks against user accounts when the authentication endpoint is accessible over the network.

User account credentials and system access.
Unlimited password guessing attempts remotely.
Unauthorized access to mission control operations.

Operational Fix

Recommended remediation, mitigation, and detection steps

Teams responsible for the mission control framework and its underlying infrastructure should prioritize understanding the reachability and business criticality of affected instances. The first practical step involves identifying all deployed instances, confirming their exposure, and locating the accountable owner to plan a risk-based remediation.

Application and Infrastructure teams own this.
Verify reachability and business impact.
Plan remediation and coordinate updates.

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.

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Frequently asked questions

What is Yamcs?

Yamcs is a mission control framework developed by Space Applications Services. It acts as a centralized platform used to monitor and command space systems, satellites, or ground segments. Because it handles sensitive operational data and mission-critical communications, it provides specialized interfaces for telemetry processing, archiving, and system management.

How does CVE-2026-44596 enable brute-force attacks?

This vulnerability is classified as CWE-307: Improper Restriction of Excessive Authentication Attempts. It means the software does not limit how many times a user can attempt to log in. Because the system lacks rate limiting or account lockout features, an attacker can automate thousands of password guesses against a single account until they eventually discover the correct credentials.

Do I need special access to trigger this bug?

You do not need prior authentication to attempt these password guesses, as the vulnerability exists at the entry point of the login process. However, the attack requires network reachability to the Yamcs authentication endpoint. If the endpoint is strictly isolated from the network where the attacker resides, or behind an effective perimeter, the trigger path is blocked.

Why is this a concern for my infrastructure?

According to Halo Surface Signal, mission control frameworks often expose management interfaces across operational networks. Even if your instance is not on the public internet, it may be reachable to anyone with access to your internal or partner-connected network segments, putting your mission operations at risk of unauthorized access.

Is there a recommended way to fix this issue?

Your first step is to perform an inventory of all Yamcs deployments to determine which are reachable across your networks. Once identified, prioritize updating your instances to version 5.12.7, 5.13.0, or later. These versions introduce the necessary authentication protections to block automated guessing attempts and secure your login process.

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.