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CVE-2026-77104 – Information Disclosure via Path Traversal – Commvault Cloud (CommServe) 11.36–11.46

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Summary

CVE-2026-77104 is a path traversal vulnerability (CWE-22) in the CommServe component of Commvault Cloud that allows unauthorized information disclosure. The issue is remotely exploitable over the network without authentication, though it requires high attack complexity, and affects both Windows and Linux deployments. It carries a CVSS v4.0 base score of 8.3 (High).

Technical details

  • Root cause: improper limitation of a pathname to a restricted directory (path traversal, CWE-22) within the CommServe component.
  • Trigger conditions: an attacker sends specially crafted input containing directory traversal sequences that CommServe fails to properly sanitize before resolving file paths.
  • Attack vector: network-based; no privileges or user interaction required, though attack complexity is rated high and attack requirements are present.
  • Impact: unauthorized disclosure of files/information outside the intended restricted directory (high confidentiality impact, low integrity impact, no direct availability impact).

Affected software

  • Commvault Cloud 11.46.0 through 11.46.19
  • Commvault Cloud 11.44.0 through 11.44.19
  • Commvault Cloud 11.40.0 through 11.40.71
  • Commvault Cloud 11.36.0 through 11.36.122
  • Platforms: Windows and Linux

Severity

  • CVSS v4.0 Base Score: 8.3 (High)
  • Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade CommServe to the resolved maintenance release for your branch — 11.46.20 or later, 11.44.20 or later, 11.40.72 or later, or 11.36.123 or later.
  • Verification: In Command Center, navigate to Manage > Servers and confirm all servers are running the resolved version or higher.
  • If immediate patching is not possible: Restrict network exposure of CommServe management interfaces to trusted networks/VPN and monitor for anomalous file access patterns until the update can be applied.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Server response header: Commvault WebServer
  • Asset URL path: /webconsole/login/index.jsp

References

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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
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