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IBM Concert CVE-2026-6721

| EUVDEUVD-2026-85661 CRITICAL
OS Command Injection (CWE-78)
2026-09-23 ibm GHSA-v72j-hv4w-mxvh
9.8
CVSS 3.1 · Vendor: ibm
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Severity by source

Vendor (ibm) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
9.8 CRITICAL

Unauthenticated remote OS command injection with no user interaction yields AV:N/AC:L/PR:N/UI:N and full C/I/A; scope unchanged as code runs as the app itself.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (ibm).

CVSS VectorVendor: ibm

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Sep 23, 2026 - 21:36 vuln.today
CVE Published
Sep 23, 2026 - 20:45 nvd
CRITICAL 9.8

DescriptionCVE.org

IBM Concert 1.0.0 through 3.0.0 allows an unauthenticated remote attacker can supply specially crafted input that is incorporated into OS commands, resulting in arbitrary command execution on the underlying system. Successful exploitation allows remote code execution with the privileges of the affected application.

AnalysisAI

Unauthenticated remote code execution in IBM Concert 1.0.0 through 3.0.0 lets any attacker who can reach the service send specially crafted input that is incorporated into operating-system commands, executing arbitrary commands with the privileges of the Concert application. The vulnerability is rated CVSS 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), meaning no authentication, no user interaction, and no special conditions are required - only network reachability of an unpatched instance. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation No special conditions - remote unauthenticated exploitation against network-reachable IBM Concert instances (versions 1.0.0 through 3.0.0), per PR:N/UI:N/AC:L. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine top-priority vulnerability, not a high-CVSS-but-low-real-risk case. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: IBM has published a fix through its support advisory at https://www.ibm.com/support/pages/node/7288830 - apply it and upgrade Concert to the latest fixed release above version 3.0.0 (the provided data does not name an exact patched build, so confirm the target version against the advisory before upgrading). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all instances of IBM Concert running versions 1.0.0 through 3.0.0 and apply the vendor-released patch per IBM's security advisory; if patching is not immediately possible, isolate these instances from untrusted networks or disable the service. …

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Improper bounds checking in IBM Concert 1.0.0 through 3.0.0 lets a local, authenticated user supply overlong input that

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IBM Concert Software 1.0.0, 1.0.1, 1.0.2, and 1.0.2.1 is vulnerable to SQL injection. Rated critical severity (CVSS 9.8)

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Improperly scoped role-based access control in IBM Concert 1.0.0 through 3.0.0 lets any authenticated user holding even

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SQL injection in IBM Concert versions 1.0.0 through 2.3.1 allows remote attackers to inject specially crafted SQL statem

CVE-2025-33015 HIGH
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Concert versions up to 2.1.0 is affected by unrestricted upload of file with dangerous type (CVSS 8.8).

CVE-2024-52359 HIGH
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IBM Concert Software 1.0.0, 1.0.1, 1.0.2, and 1.0.2.1 could allow an authenticated user to perform unauthorized actions

CVE-2026-6935 HIGH
7.8 Sep 23

Local privilege escalation in IBM Concert 1.0.0 through 3.0.0 lets an attacker who already holds a low-privileged accoun

CVE-2026-6794 HIGH
7.8 Sep 23

Heap memory corruption in IBM Concert 1.0.0 through 3.0.0 lets an attacker who already has low-privileged local access t

CVE-2025-33088 HIGH
7.4 Feb 17

Concert versions up to 2.1.0 is affected by incorrect permission assignment for critical resource (CVSS 7.4).

CVE-2026-17465 MEDIUM
6.5 Sep 22

An authenticated remote user of IBM Concert versions 1.0.0 through 3.0.0 can degrade or deny service availability by dri

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CVE-2026-6721 vulnerability details – vuln.today

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