CVE-2026-6719 in Concert
Summary
by MITRE • 10/19/2026
IBM Concert 1.0 through 3.0.0 uses weaker than expected cryptographic algorithms that could allow an attacker to decrypt highly sensitive information.
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Analysis
by VulDB Data Team • 10/19/2026
The vulnerability identified in IBM Concert versions 1.0 through 3.0.0 represents a critical failure in the implementation of cryptographic controls, specifically categorized under CWE-327 as the use of a broken or risky cryptographic algorithm. This flaw stems from the application's reliance on encryption primitives that have been deprecated due to known mathematical weaknesses and insufficient key lengths by modern security standards. In contemporary cybersecurity frameworks, algorithms such as DES or early iterations of RC4 are considered obsolete because they can be cracked using brute-force attacks or sophisticated cryptanalytic techniques within a feasible timeframe. The presence of these weaker algorithms indicates that the software was either developed without adhering to current best practices for data protection or failed to update its cryptographic modules in response to evolving threat landscapes and computational advancements.
From an operational perspective, this weakness allows unauthorized actors to intercept encrypted communications or access stored sensitive data by reversing the encryption process. An attacker positioned as a passive observer on the network can capture traffic protected by these weak algorithms and subsequently decrypt it using readily available tools. This capability directly compromises the confidentiality of information transmitted through IBM Concert, potentially exposing proprietary business logic, customer personal identifiable information, authentication credentials, or other high-value assets. The impact extends beyond simple data leakage; if attackers can decrypt session tokens or authentication cookies, they may also achieve unauthorized access to administrative functions, leading to a complete compromise of system integrity and availability.
This vulnerability aligns with the MITRE ATT&CK technique T1538, which involves gathering information from cloud service APIs, as well as general data exfiltration methods where encrypted channels are bypassed through cryptographic weakness. The exploitation does not require complex injection vectors or privilege escalation; it relies solely on the ability to observe network traffic and apply known decryption techniques against the weak cipher suites employed by the application. This makes the vulnerability particularly dangerous in environments where secure transport protocols like TLS are configured with legacy ciphers that prioritize compatibility over security, inadvertently enabling this attack vector during handshake negotiations.
To mitigate this risk, organizations running IBM Concert versions 1.0 through 3.0.0 must immediately upgrade to a patched version of the software if one is provided by the vendor. If an update is unavailable, administrators should enforce strict cipher suite policies on any reverse proxies or load balancers sitting in front of the application to prevent negotiation with weak cryptographic algorithms during TLS handshakes. It is also critical to audit internal configurations to ensure that no legacy protocols are enabled for data storage encryption within the application itself. Regular security assessments and penetration testing focused on cryptographic implementation should be conducted to verify that only strong, modern algorithms such as AES-256 or ChaCha20 with appropriate modes of operation like GCM are utilized for protecting sensitive information in transit and at rest.