What is CVE-2026-77105?

CVE-2026-77105 is a high-severity vulnerability in Commvault, classified under Improper Verification of Cryptographic Signature. CVSS score: 8.8/10. Published 2026-09-08.

How severe is CVE-2026-77105?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Commvault

CVE-2026-77105

CommServe contained a cryptographic signature verification issue affecting privilege management. Software customers upgrade to resolved maintenance release. Update CommServe and Web Server.

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

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (21.7th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

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

Frequently asked questions

What is CVE-2026-77105?: CVE-2026-77105 is a high-severity vulnerability in Commvault, classified under Improper Verification of Cryptographic Signature. CVSS score: 8.8/10. Published 2026-09-08.
How severe is CVE-2026-77105?: High severity. CVSS v3 base score is 8.8 out of 10.