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CVE-2026-46410 – Unauthenticated Information Disclosure – FileBrowser Quantum prior to 1.3.2-stab…

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Summary

CVE-2026-46410 is a high-severity unauthenticated information disclosure vulnerability in FileBrowser Quantum, a free, self-hosted, web-based file manager maintained by gtsteffaniak. The flaw allows unauthenticated remote attackers to retrieve sensitive data — specifically file source and path information — through the application’s share functionality, without any credentials or user interaction. It carries a CVSS 4.0 score of 8.7 (HIGH) and affects all versions prior to 1.3.2-stable and 1.4.1-beta.

Technical details

  • Root cause: Improper access controls on the share functionality (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) allow unauthenticated requests to retrieve sensitive metadata that should be restricted to authenticated users.
  • Exposed data: File source identifiers and file path information are leaked through the vulnerable share endpoint.
  • Trigger conditions: No authentication, no special configuration, and no user interaction are required to trigger the disclosure — attack complexity is low.
  • Attack vector: Network-accessible; FileBrowser Quantum exposes an HTTP/HTTPS interface, making any internet-exposed instance directly reachable by remote attackers.
  • Impact: Confidentiality impact is rated HIGH (VC:H in CVSS 4.0). Leaked path and source data can facilitate targeted follow-on attacks, such as directory traversal or file-read exploitation against the same instance.

Affected software

  • FileBrowser Quantum (github.com/gtsteffaniak/filebrowser) — all versions prior to 1.3.2-stable
  • FileBrowser Quantum (github.com/gtsteffaniak/filebrowser) — all versions prior to 1.4.1-beta

Severity

CVSS 4.0 Base Score: 8.7 (HIGH)
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

No CVSS v3.1 score has been assigned for this CVE.

Mitigation and recommended actions

  • Immediate: Upgrade FileBrowser Quantum to 1.3.2-stable (stable channel) or 1.4.1-beta (beta channel). Both versions contain the fix (commit 1802e128).
  • No known workarounds: The vendor advisory states no workarounds are available. Patching is the only remediation.
  • Until patching is complete, consider restricting public network access to any FileBrowser Quantum instance using firewall rules or access controls at the network perimeter.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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1

Map your entire attack surface (continously)

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Monitor for new CVEs

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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.

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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

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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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