What is CVE-2026-13738?

CVE-2026-13738 is a critical-severity vulnerability in Commvault, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2026-08-11.

How severe is CVE-2026-13738?

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

Auth bypass in Commvault

CVE-2026-13738

CommServe contained an authorization bypass vulnerability affecting a limited set of command execution operations. Software customers upgrade to resolved maintenance release. Update all Commvault installations, including Commserve, Webserver, Command Center, Media Agents, Clients and HyperScale X.

Vulnerability class: Broken Access Control

Published 2026-08-11 · 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 (47.8th percentile), scored 2026-09-25.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001

Affected products

Commvault
Commvault Cloud — versions 11.46.0, 11.44.0, 11.40.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

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

Frequently asked questions

What is CVE-2026-13738?: CVE-2026-13738 is a critical-severity vulnerability in Commvault, classified under Incorrect Authorization. CVSS score: 9.8/10. Published 2026-08-11.
How severe is CVE-2026-13738?: Critical severity. CVSS v3 base score is 9.8 out of 10.