CVE-2025-27909 in Concert Software
Summary
by MITRE • 08/18/2025
IBM Concert Software 1.0.0 through 1.1.0 uses cross-origin resource sharing (CORS) which could allow an attacker to carry out privileged actions as the domain name is not being limited to only trusted domains.
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Analysis
by VulDB Data Team • 08/22/2025
IBM Concert Software versions 1.0.0 through 1.1.0 implements cross-origin resource sharing mechanisms that fail to properly validate origin domains, creating a significant security vulnerability classified under CWE-346. This flaw allows attackers to exploit the CORS configuration by crafting malicious requests from unauthorized origins, potentially enabling them to execute privileged actions on behalf of legitimate users. The vulnerability stems from the software's failure to implement strict origin validation, which should restrict resource access to only explicitly trusted domains as recommended in OWASP API Security Top 10. The insecure CORS policy enables attackers to bypass authentication mechanisms and perform unauthorized operations within the application's security context.
The operational impact of this vulnerability extends beyond simple data theft, as it creates a pathway for attackers to manipulate application behavior and potentially escalate privileges. An attacker could leverage this weakness to make authenticated requests to the application's API endpoints from malicious domains, effectively impersonating legitimate users and accessing restricted resources. This type of vulnerability aligns with ATT&CK technique T1078.004 which covers valid accounts abuse through web application vulnerabilities. The attack surface is particularly concerning given that the vulnerability affects multiple versions of the software, suggesting a systemic configuration issue rather than a one-time coding error.
Mitigation strategies should focus on implementing strict CORS policies that explicitly define trusted origins using the Access-Control-Allow-Origin header with specific domain values rather than wildcard characters. Organizations should configure the software to validate the origin header against a predefined whitelist of trusted domains and implement proper authentication checks for all API endpoints. Additionally, the application should enforce Content Security Policy headers to further restrict cross-origin operations and prevent malicious scripts from executing. Security teams should conduct comprehensive penetration testing to verify that the CORS configuration properly restricts access and that no unauthorized domains can establish cross-origin requests. The implementation should follow NIST SP 800-53 security controls for web application security and ensure that all cross-origin requests undergo rigorous validation before granting access to protected resources.