CVE-2026-77090Network attack vector

Information disclosure via XML external entity references

Published Oct 13, 2026 · Updated Oct 13, 2026

XXE in Commvault File System (CVFS) on Linux allows remote attackers to obtain information via XML external entity references. Commvault identifies faulty external entity reference handling but does not disclose the parser, entry point, or specific data exposed. Exploitation requires network reachability without authentication or user interaction; affected Commvault Cloud deployments use CVFS on HyperScale X.

CVSS severity8.7
High
EPSS probability0.33%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XXE in Commvault File System (CVFS) on Linux allows remote attackers to obtain information via XML external entity references. Commvault identifies faulty external entity reference handling but does not disclose the parser, entry point, or specific data exposed. Exploitation requires network reachability without authentication or user interaction; affected Commvault Cloud deployments use CVFS on HyperScale X.

The record

CVE
CVE-2026-77090
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
Commvault
Product
Commvault File System (CVFS)
Classifications
CWE-611
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.0.1.0 <=5.0.14.4 changes=[{"at":"5.0.14.5","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Commvault · Commvault File System (CVFS)version=5.0.1.0 <=5.0.14.4 changes=[{"at":"5.0.14.5","status":"unaffected"}]
Commvault · Commvault Cloudversion=11.36.0 <=11.36.126 changes=[{"at":"11.36.127","status":"unaffected"}]; version=11.40.0 <=11.40.77 changes=[{"at":"11.40.78","status":"unaffected"}]; version=11.44.0 <=11.44.24 changes=[{"at":"11.44.25","status":"unaffected"}]; version=11.46.0 <=11.46.29 changes=[{"at":"11.46.30","status":"unaffected"}]

Published CVSS scores

8.7CommvaultCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-611Improper Restriction of XML External Entity Reference

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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