Patch Forecast
Amber warning
Patch this week.

CVE-2026-6721

Ibm Concert: OS command injection can lead to remote code execution

Risk score
78/100
CVSS
9.8 v3.1
Exploit chance (30 days)
1.4%
Published
23 Sep 2026

Open in the live forecast Today's forecast

What to know

What it is
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.
Affected
Ibm Concert
Fix
Apply the vendor's security update; see the linked advisory.
Exploitation
No known exploitation

Story map

Story map: Ibm ConcertTHE FLAWSTHE FIXCVE-2026-6721OS command injection can leadto remote code executionCVSS 9.8 · EPSS 1%CVE-2026-6928IBM Concert 1.0.0 through3.0.0 references or accessesmemory after it has been…CVSS 9.8 · EPSS 0%CVE-2026-6719IBM Concert 1.0 through 3.0.0uses weaker than expectedcryptographic algorithms that…CVSS 7.5 · EPSS 0%CVE-2026-6730Buffer overflow can lead toremote code executionCVSS 7.8 · EPSS 0%FixApply the vendor's securityupdate; see the linked advisory.Who is exposedIbm ConcertAMBER · PATCH THIS WEEKIbm ConcertIBM Concert 1.0.0 through 3.0.0allows an unauthenticatedremote attacker can supplyspecially crafted input that isincorporated into OS commands,resulting in arbitrary commandexecution on the underlying…Where it standsNo known exploitationCONNECTS TOSame weaknessOS command injection (CWE-78)399 other warnings in 30 days →Same productEarlier Ibm Concert warnings13 in the last 90 days →
Story map: the flaws, the fix, how it unfolded and what it connects to. Boxes link to the record or article.

At a glance

Ibm Concert: Amber, patch this week. 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.

The flaws

  • CVE-2026-6721: OS command injection can lead to remote code execution (CVSS 9.8 · EPSS 1%)
  • CVE-2026-6928: IBM Concert 1.0.0 through 3.0.0 references or accesses memory after it has been freed (CVSS 9.8 · EPSS 0%)
  • CVE-2026-6719: IBM Concert 1.0 through 3.0.0 uses weaker than expected cryptographic algorithms that could allow… (CVSS 7.5 · EPSS 0%)
  • CVE-2026-6730: Buffer overflow can lead to remote code execution (CVSS 7.8 · EPSS 0%)

The fix

Fix: Apply the vendor's security update; see the linked advisory.

Who is exposed: Ibm Concert

Where it stands

  • No known exploitation

Connects to

Why it is Amber

  • CVSS 9.8 critical
  • Remotely exploitable without logging in

References

Original description

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.

Last activity 23 Sep 2026. Patch Forecast updates every hour.