CVE-2026-1568 in Vulnerability Management
Summary
by MITRE • 02/03/2026
Rapid7 InsightVM versions before 8.34.0 contain a signature verification issue on the Assertion Consumer Service (ACS) cloud endpoint that could allow an attacker to gain unauthorized access to InsightVM accounts setup via "Security Console" installations, resulting in full account takeover. The issue occurs due to the application processing these unsigned assertions and issuing session cookies that granted access to the targeted user accounts. This has been fixed in version 8.34.0 of InsightVM.
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Analysis
by VulDB Data Team • 02/03/2026
The vulnerability described in CVE-2026-1568 represents a critical authentication bypass flaw within Rapid7 InsightVM software versions prior to 8.34.0. This issue specifically targets the Assertion Consumer Service (ACS) endpoint which serves as a crucial component in SAML-based single sign-on implementations. The vulnerability stems from improper signature verification mechanisms that fail to validate the authenticity of SAML assertions received from identity providers. This flaw allows attackers to exploit the lack of cryptographic validation during the SAML authentication flow, creating a pathway for unauthorized account access through security console installations.
The technical implementation of this vulnerability involves the application's failure to properly verify digital signatures on SAML assertions before processing them. According to CWE-347, this represents a weakness in the validation of cryptographic signatures, specifically targeting the absence of proper signature verification in security protocols. The flaw manifests when the InsightVM application accepts unsigned SAML assertions and proceeds to issue session cookies based on these unverified assertions. This processing behavior directly violates security principles outlined in the OWASP Top Ten, particularly the authentication and session management vulnerabilities that can lead to full account compromise.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it enables complete account takeover capabilities for authenticated users within the InsightVM environment. Attackers can leverage this flaw to impersonate legitimate users and gain administrative privileges, potentially leading to complete system compromise. The vulnerability affects installations using Security Console configurations, which typically serve as centralized management interfaces for security operations. This creates a significant risk for organizations relying on InsightVM for vulnerability management and security orchestration, as successful exploitation could result in unauthorized access to critical security infrastructure. The issue has been classified under ATT&CK technique T1078.004, which covers valid accounts with compromised credentials, and T1566.002, representing spearphishing with malicious attachments or links that could facilitate initial access.
Mitigation strategies for CVE-2026-1568 require immediate deployment of Rapid7 InsightVM version 8.34.0 or later, which includes proper signature verification mechanisms for SAML assertions. Organizations should also implement network segmentation to limit access to the ACS endpoint, enforce strict access controls on management interfaces, and monitor for suspicious authentication patterns. Security teams must conduct thorough vulnerability assessments to identify any potential exploitation attempts and ensure that all SAML-based integrations properly validate cryptographic signatures. Additionally, implementing multi-factor authentication and regular security audits of identity provider configurations can provide additional defense-in-depth measures against similar vulnerabilities in the authentication infrastructure.