CVE-2026-20003 in Secure Firewall Management Center
Summary
by MITRE • 03/04/2026
A vulnerability in the REST API of Cisco Secure FMC Software could allow an authenticated, remote attacker to conduct SQL injection attacks on an affected system. This vulnerability is due to inadequate validation of user-supplied input. An attacker could exploit this vulnerability by sending crafted requests to an affected device. A successful exploit could allow the attacker to obtain read access to the database and read certain files on the underlying operating system. To exploit this vulnerability, the attacker would need valid user credentials with any of the following roles: Administrator Security approver Intrusion admin Access admin Network admin
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Analysis
by VulDB Data Team • 03/05/2026
The vulnerability identified as CVE-2026-20003 represents a critical security flaw within the REST API implementation of Cisco Secure FMC Software, exposing organizations to significant risks of unauthorized data access and system compromise. This vulnerability stems from insufficient input validation mechanisms that fail to properly sanitize user-supplied data before processing, creating an avenue for malicious actors to manipulate the application's database interactions through carefully crafted API requests. The weakness exists specifically within the API layer where user inputs are not adequately filtered or escaped, allowing attackers to inject malicious SQL commands that can be executed by the underlying database engine.
The technical exploitation of this vulnerability requires an attacker to possess valid authentication credentials with any of the specified administrative roles including Administrator, Security approver, Intrusion admin, Access admin, or Network admin. This requirement significantly reduces the attack surface compared to unauthenticated exploits but still represents a serious threat since it leverages legitimate administrative access to escalate privileges and gain unauthorized database access. The vulnerability manifests through SQL injection techniques that enable attackers to extract sensitive information from the database, including but not limited to user credentials, configuration data, and system files that should remain protected. The impact extends beyond simple data theft as the successful exploitation can provide attackers with read access to underlying operating system files, potentially enabling further system compromise and lateral movement within the network environment.
From a cybersecurity perspective, this vulnerability aligns with CWE-89 which specifically addresses SQL injection flaws in software applications, and represents a clear violation of the principle of least privilege as it allows authenticated users to escalate their access beyond intended boundaries. The ATT&CK framework categorizes this vulnerability under T1078 Valid Accounts and T1046 Network Service Scanning, as the exploitation requires legitimate administrative credentials and leverages the network-facing REST API to access database resources. Organizations utilizing Cisco Secure FMC Software face substantial operational risks including potential data breaches, compliance violations, and system integrity compromises that could affect critical security infrastructure. The vulnerability's impact is particularly concerning given that it affects the core management interface of the security platform, potentially allowing attackers to undermine the very security controls that protect the organization's network infrastructure.
The mitigation strategies for CVE-2026-20003 should prioritize immediate patching of affected systems to address the underlying input validation deficiencies in the REST API implementation. Organizations must implement robust access control measures and regularly audit administrative credentials to minimize the risk of unauthorized access, while also deploying network monitoring solutions to detect anomalous API activity that could indicate exploitation attempts. Additionally, implementing proper input sanitization and parameterized queries in the API codebase would provide fundamental protection against similar SQL injection vulnerabilities. Security teams should also consider implementing database activity monitoring and establishing incident response procedures specifically tailored to address SQL injection attacks targeting security infrastructure components. The vulnerability serves as a reminder of the critical importance of input validation in web applications and the need for comprehensive security testing throughout the software development lifecycle to prevent such flaws from reaching production environments.