What is CVE-2026-77089?

CVE-2026-77089 is a critical-severity vulnerability in Commvault, classified under Authentication Bypass by Spoofing. CVSS score: 9.8/10. Published 2026-09-08.

How severe is CVE-2026-77089?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Commvault

CVE-2026-77089

Command Center API contained an authentication bypass issue affecting privilege management. Software customers upgrade to resolved maintenance release. Update Command Center.

Published 2026-09-08 · last modified 2026-09-11.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (48.6th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003

Affected products

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

050066fd-a2f9-4f32-ab5d-4c53f48bc333 (Vendor Advisory)

Frequently asked questions

What is CVE-2026-77089?: CVE-2026-77089 is a critical-severity vulnerability in Commvault, classified under Authentication Bypass by Spoofing. CVSS score: 9.8/10. Published 2026-09-08.
How severe is CVE-2026-77089?: Critical severity. CVSS v3 base score is 9.8 out of 10.