CVE-2026-77103: CommServe contained an authentication bypass issue affecting access authorization and information disclosure

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-77103 is a high-severity flaw (CVSS 7.5) affecting commvault. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CommServe contained an authentication bypass issue affecting access authorization and information disclosure. Software customers upgrade to resolved maintenance release. Update CommServe.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-288
Published	2026-09-08
Last modified	2026-09-09

Publisher (CNA): Commvault · Vendor: commvault

Last updated 2026-09-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-08 13:17 UTCPublished CVE record published
2026-09-09 15:56 UTCUpdated Record last modified

commvault commvault UPGRADE

Affected: >= 11.36.0 and < 11.36.123 · >= 11.40.0 and < 11.40.72 · >= 11.44.0 and < 11.44.20 · >= 11.46.0 and < 11.46.20

Fixed in: 11.36.123, 11.40.72, 11.44.20, 11.46.20

Safe to downgrade to: a release before 11.36.0

1. Check installed version

apt-cache policy commvault || rpm -q commvault || commvault --version

2. UPGRADE to 11.36.123 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade commvault

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade commvault

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 11.36.0 (Debian / Ubuntu)

apt-cache madison commvault sudo apt install commvault=<VERSION_BEFORE_11.36.0> sudo apt-mark hold commvault

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list commvault sudo dnf downgrade commvault-<VERSION_BEFORE_11.36.0> sudo dnf versionlock add commvault

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-77103?

commvault: upgrade to 11.36.123, 11.40.72, 11.44.20, 11.46.20. Exact commands for each OS are on this page.

Is CVE-2026-77103 being exploited?

CVE-2026-77103 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-77103 affect?

CVE-2026-77103 affects commvault. Severity is high (CVSS 7.5). CommServe contained an authentication bypass issue affecting access authorization and information disclosure. Software customers upgrade to resolved maintenance release. Update CommServe.

How urgent is CVE-2026-77103?

Priority 42/100. High severity; Remotely exploitable, no login, no user action

Software pages

Commvault vulnerabilities

Related CVEs

CVE-2026-13738 CRITICAL 9.8 UPGRADE CommServe contained an authorization bypass vulnerability affecting a limited set of command execution operati
CVE-2026-13737 CRITICAL 9.8 UPGRADE CommServe contained an allowlist bypass vulnerability affecting command execution authorization
CVE-2026-13739 CRITICAL 9.8 UPGRADE A legacy endpoint in Command Center contained an unauthenticated server-side request forgery (SSRF) vulnerabil
CVE-2026-77106 HIGH 8.8 UPGRADE Cvlaunchd contained a missing authorization issue affecting command execution authorization
CVE-2026-77089 CRITICAL 9.8 UPGRADE Command Center API contained an authentication bypass issue affecting privilege management

References

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