Authentication Bypass in CommServe from Commvault
CVE-2026-77103

8.7HIGH

Key Information:

Vendor

Commvault

Status
Commvault Cloud
Vendor
CVE Published:
8 September 2026

What is CVE-2026-77103?

CommServe from Commvault experiences a significant authentication bypass vulnerability, which compromises access authorization and may lead to unauthorized information disclosure. Users are strongly advised to upgrade to the latest maintenance release to mitigate potential risks and secure their systems.

Affected Version(s)

Commvault Cloud Windows 11.46.0 <= 11.46.19

Commvault Cloud Windows 11.44.0 <= 11.44.19

Commvault Cloud Windows 11.40.0 <= 11.40.71

References

https://documentation.commvault.com/securityadvisories/CV...

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Michael Tucker and Tan Chew Keong from the XOR team at JPMorgan Chase.
.