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patchPublished Oct 19, 2026· 1 source

IBM Concert: Nine Vulnerabilities Disclosed Together, Including High-Severity Crypto Flaw

Key findings • Nine vulnerabilities disclosed for IBM Concert (v1.0-3.0.0) on October 19, 2026. • High severity flaw (CVE-2026-6719) allows decryption of sensitive information due to weak cry…

Key findings

  • Nine vulnerabilities disclosed for IBM Concert (v1.0-3.0.0) on October 19, 2026.
  • High severity flaw (CVE-2026-6719) allows decryption of sensitive information due to weak crypto algorithms.
  • Multiple information disclosure vulnerabilities (CVE-2026-3628, CVE-2026-1510, CVE-2026-15661) present.
  • Cross-site scripting (CVE-2026-4413) allows arbitrary JavaScript injection.
  • Users are urged to update to patched versions to mitigate risks.

On October 19, 2026, a batch of nine vulnerabilities was disclosed for IBM Concert, affecting versions 1.0 through 3.0.0. The vulnerabilities, disclosed within a one-hour window, span a range of severities from Low to High, with the most critical flaw allowing for the decryption of highly sensitive information. This coordinated disclosure event highlights potential weaknesses in cryptographic algorithms, cross-site scripting, and information exposure within the Concert platform.

Several vulnerabilities center on information disclosure. CVE-2026-6719 and CVE-2026-6930, both rated High and Low respectively, point to the use of weaker-than-expected cryptographic algorithms that could permit an attacker to decrypt sensitive data. Additionally, CVE-2026-3628 involves information disclosure through the exposure of schema suggestions, while CVE-2026-1510 relates to information disclosure via heap inspection. Another information disclosure vulnerability, CVE-2026-15661, arises from improper neutralization of special elements when writing to log files, potentially allowing data injection into log messages.

Further complicating the security posture of IBM Concert, CVE-2026-4413 presents a medium-severity cross-site scripting (XSS) vulnerability. This flaw could enable an unauthenticated attacker to inject arbitrary JavaScript code into the Web UI, potentially leading to credential disclosure within a trusted session. CVE-2026-4405, a medium-severity issue, allows web page cache to be stored locally, readable by other users on the system. Lastly, CVE-2026-3303, a low-severity vulnerability, involves the use of cross-origin resource sharing (CORS) without proper domain validation, which could allow an attacker to perform privileged actions. CVE-2026-1501, also low severity, is due to improper certificate validation.

IBM has addressed these vulnerabilities in subsequent releases. Users of IBM Concert are strongly advised to update to a version that includes the patches for these issues to mitigate the risks associated with cryptographic weaknesses, cross-site scripting, and various forms of information disclosure. The swift disclosure and patching of these vulnerabilities underscore the importance of timely updates for maintaining the security of sensitive data and application integrity.

The coordinated disclosure of these nine vulnerabilities on October 19, 2026, presents a significant security update for users of IBM Concert. The range of issues, from critical data decryption to less severe but still exploitable flaws like XSS and information exposure, necessitates prompt attention from administrators. Ensuring that all affected versions are updated is crucial for protecting against potential exploitation and maintaining the confidentiality and integrity of the data managed by Concert.

The batch of vulnerabilities includes:

All affected versions are 1.0 through 3.0.0. Users should consult IBM's official advisories for specific patch versions and recommended remediation steps.

This coordinated disclosure event highlights the importance of a proactive security approach for IBM Concert users. The variety of vulnerabilities, including those with high severity, requires immediate attention to ensure the security of sensitive information and the integrity of the application.

The vulnerabilities disclosed include: CVE-2026-6719, CVE-2026-4413, CVE-2026-4405, CVE-2026-3628, CVE-2026-3303, CVE-2026-1510, CVE-2026-1501, CVE-2026-6930, CVE-2026-15661.

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