External risk intelligence

WellSky Harmony SQL Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2025-56385

The vulnerability resides in the login functionality of a web application endpoint. As a login portal, this service is designed to be public-facing to facilitate user authentication, making it an internet-reachable surface by design.

SQL Injection

Wellsky Harmony

4.1.0.2.83

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

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical security flaw has been identified in the WellSky Harmony software, specifically within its login feature. This vulnerability could allow unauthorized access, potentially leading to data breaches or system compromise.

Login flaw allows unauthorized system access.
Critical flaw impacts sensitive data and systems.
Confirm relevance and exposure across all systems.

Attack Path

How an attacker could exploit the issue

An attacker can exploit this vulnerability by sending specially crafted input to the login page of the WellSky Harmony application. This input targets the 'TXTUSERID' parameter on the 'xmHarmony.asp' endpoint, which is not properly validated before being used in a SQL query. If successful, this could allow an attacker to bypass authentication, access sensitive data, or gain full control over the backend database.

No prior authentication required.
SQL injection via 'TXTUSERID' parameter.
Potential for authentication bypass and data compromise.

Live Threat

Current exploitation, exposure, and threat context

A SQL injection vulnerability in WellSky Harmony's login functionality could allow an unauthenticated attacker to bypass authentication. When supported, this could expose sensitive information from the backend database or lead to unauthorized modification or deletion of data, depending on the attacker's actions.

Database contents could be accessed or modified.
Malicious SQL commands could be injected.
Sensitive data could be leaked or altered.

Operational Fix

Recommended remediation, mitigation, and detection steps

The WellSky Harmony application owner and infrastructure team are likely responsible for addressing this SQL injection vulnerability. The first practical move is to identify all instances of WellSky Harmony, confirm their exposure and criticality, and then coordinate remediation efforts with the vendor.

Identify WellSky Harmony instances.
Confirm public exposure and business criticality.
Coordinate vendor-supported remediation.

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 WellSky Harmony?

WellSky Harmony is a software platform often used in clinical and care management settings to handle sensitive information and operational workflows. The version mentioned in this advisory, 4.1.0.2.83, is a specific iteration of this enterprise application that includes a web-based login interface for user access.

What does CVE-2025-56385 mean in plain English?

This is a SQL injection vulnerability, categorized as CWE-89. It means the application fails to properly clean user input before processing it. By entering specially formatted text into the username field, an unauthorized person can trick the system into running unintended database commands, potentially exposing private data or bypassing login security entirely.

How does an attacker trigger this vulnerability?

The flaw is triggered by sending malicious input to the 'TXTUSERID' parameter on the 'xmHarmony.asp' login page. Because this is a pre-authentication issue, no account or password is required to attempt the injection. Simply viewing the login page without submitting specially crafted data does not trigger the vulnerability.

Do I need to worry if my WellSky Harmony instance is internal?

According to Halo Surface Signal, this vulnerability is particularly concerning because the affected component is a login portal, which is typically intended to be internet-facing for user access. If your instance is restricted to a private internal network, it is less reachable from the open internet, but it may still be at risk from unauthorized actors already inside your network perimeter.

What should I do first to address this security flaw?

Your first step is to locate all deployments of WellSky Harmony within your infrastructure to understand your potential footprint. Once identified, evaluate their network placement and business impact. After assessing the risk, work directly with the vendor to obtain and apply the necessary updates or security patches to secure the login endpoint.

References

machevalia.blog/blog/cve-2025-56385-wellsky-harmony-sql-injection

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.