CVE-2026-57588: SQL Injection in Nessus Scan Results Import—Patch Guidance

Technical summary

CVE-2026-57588 is a SQL injection vulnerability (CWE-89) in Tenable Nessus stemming from insufficient input validation on imported scan result files. When a privileged user imports a malicious scan result file, unsanitized data flows into database queries without proper parameterization or escaping. An attacker who can deliver a crafted .nessus file or similar scan export can inject arbitrary SQL, potentially querying or exfiltrating scan results that contain network reconnaissance data, vulnerability findings, and other sensitive information from prior assessments.

Business impact

Nessus is widely used by security teams to manage vulnerability assessments across enterprise networks. Compromise of the scan results database could expose detailed intelligence about an organization's network architecture, identified weaknesses, and remediation status—information highly valuable to threat actors. While this vulnerability requires local access and user action, it could be chained with social engineering or initial access techniques to extract comprehensive network intelligence before launching further attacks. Teams relying on Nessus should recognize that their scan result repository is a high-value target.

Affected systems

Tenable Nessus installations are affected. The vulnerability manifests when a privileged user (typically a security administrator or scan operator) imports a scan result file. Organizations using Nessus for vulnerability management, including cloud-based and on-premises deployments, should verify their specific product version against Tenable's advisory to confirm exposure and patch availability.

Exploitability

Exploitation requires an attacker to craft a malicious scan result file and persuade a privileged Nessus user to import it. This represents a moderate barrier: the attacker needs both file delivery capability and user cooperation (indicated by the UI:R requirement in the CVSS vector). However, phishing security teams with fake scan exports or compromised vendor communications could make this plausible in targeted scenarios. Once imported, SQL injection execution is likely straightforward, making the vulnerability itself technically simple to exploit given access.

Remediation

Patch Nessus to a version that properly sanitizes scan result file inputs and uses parameterized queries for database operations. Tenable will provide specific patched versions; verify against their official security advisory. As an interim measure, restrict scan result import permissions to trusted users, implement file integrity monitoring on scan export repositories, and educate teams on the risks of importing scans from untrusted sources or unexpected channels.

Patch guidance

Apply the latest Nessus security update from Tenable as documented in their official advisory for CVE-2026-57588. Verify the patched version number and compatibility with your deployment model (cloud, on-premises, or Nessus Essentials) before rolling out. Test patched versions in a non-production environment first. Until patching is complete, apply the interim controls mentioned above to reduce attack surface.

Detection guidance

Monitor Nessus import activities using audit logs; flag imports from unexpected sources or by unusual user accounts. Database activity monitoring can detect anomalous SQL execution patterns following scan result imports. Intrusion detection systems may identify malformed scan result files if they match known injection signatures. Network segmentation isolating Nessus from sensitive data repositories provides defense-in-depth. Review recent scan imports and correlate with any unauthorized data access events.

Why prioritize this

Despite a low CVSS score (3.3), this vulnerability warrants attention because Nessus scan results are a prized intelligence asset. The combination of high-value target data, relative ease of exploitation once delivered, and the privileged database access it provides make it attractive for targeted attacks. Organizations should prioritize patching based on Nessus's role in their security operations and the sensitivity of stored scan results, rather than CVSS score alone.

Risk score, explained

The CVSS 3.1 score of 3.3 (LOW) reflects the requirement for local access, no privileges, but mandatory user interaction, and limited scope (confidentiality impact only). However, contextual risk is higher: Nessus results are high-value intelligence, the database is often trusted, and SQL injection is a well-understood attack vector. Organizations should apply professional judgment based on their threat model and whether Nessus contains data that would be attractive to adversaries.

Frequently asked questions