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CVE-2026-77089 – Authentication Bypass – Commvault Command Center API (Multiple Versions)

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Summary

CVE-2026-77089 is a critical authentication bypass vulnerability in the Command Center API of Commvault Cloud, affecting privilege management. The flaw allows an attacker to circumvent authentication controls over the network without requiring credentials or user interaction, and carries a CVSS score of 9.3 (Critical).

Technical details

  • Root cause: an authentication bypass by spoofing (CWE-290) in the Command Center API that affects privilege management.
  • Trigger conditions: no authentication, privileges, or user interaction are required to exploit the flaw.
  • Attack vector: network-based, low attack complexity, no attack requirements.
  • Impact: high confidentiality and integrity impact, consistent with unauthorized access to API functions and privileged operations within Command Center.

Affected software

  • Commvault Cloud (Windows and Linux platforms), versions 11.46.0 through 11.46.19
  • Commvault Cloud (Windows and Linux platforms), versions 11.44.0 through 11.44.19
  • Commvault Cloud (Windows and Linux platforms), versions 11.40.0 through 11.40.71
  • Commvault Cloud (Windows and Linux platforms), versions 11.36.0 through 11.36.122

Severity

  • CVSS v4.0 Base Score: 9.3 (Critical)
  • Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: upgrade Commvault Command Center to the resolved maintenance release for your branch — 11.46.20 or later, 11.44.20 or later, 11.40.72 or later, or 11.36.123 or later.
  • Verification: in Command Center, go to Manage > Servers, filter by Web Server role, and confirm all systems are running the resolved maintenance release or higher.
  • If patching cannot be applied immediately, restrict network exposure of the Command Center web interface/API to trusted networks until the update is applied, as no other workaround has been published by the vendor.

References

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