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PatchSiren cyber security CVE debrief

CVE-2026-77091 Commvault CVE debrief

CVE-2026-77091 is a high-severity path traversal vulnerability in Commvault Cloud, affecting security feature enforcement with a CVSS score of 8.5. Defenders should assess exposure and prioritize upgrading to a resolved maintenance release and updating Content Extractor and Index Store. The vulnerability allows attackers to bypass security controls, potentially leading to unauthorized access and data breaches. Commvault customers are advised to review and apply vendor advisory guidance to mitigate the vulnerability. Verify and upgrade to a resolved maintenance release to prevent path traversal and ensure security feature enforcement.

Vendor
Commvault
Product
Commvault Cloud
CVSS
HIGH 8.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-11
Advisory published
2026-09-08
Advisory updated
2026-09-11

Who should care

Defenders responsible for Commvault Cloud deployments should assess exposure and prioritize upgrading to a resolved maintenance release and updating Content Extractor and Index Store.

Why it matters

CVE-2026-77091 is a high-severity path traversal vulnerability in Commvault Cloud, affecting security feature enforcement. Defenders should prioritize upgrading to a resolved maintenance release and updating Content Extractor and Index Store to mitigate the vulnerability.

  • Verify and upgrade to a resolved maintenance release to prevent path traversal
  • Update Content Extractor and Index Store to ensure security feature enforcement
  • Review and apply vendor advisory guidance to mitigate vulnerability

Technical summary

CVE-2026-77091 is a high-severity path traversal vulnerability in Commvault Cloud, affecting security feature enforcement. The vulnerability has a CVSS score of 8.5 and is considered high severity. Commvault customers are advised to upgrade to a resolved maintenance release and update Content Extractor and Index Store.

Defensive priority

Defenders should prioritize upgrading to a resolved maintenance release and updating Content Extractor and Index Store to mitigate the path traversal vulnerability in Commvault Cloud.

Recommended defensive actions

  • Upgrade to a resolved maintenance release
  • Update Content Extractor and Index Store
  • Review and apply vendor advisory guidance

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the path traversal vulnerability in Commvault Cloud. The vendor advisory from Commvault also provides guidance on resolving the issue.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-77091 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-77091

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-77091 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-77091

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://documentation.commvault.com/securityadvisories/CV_2026_07_3.html

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

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.