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CVE-2026-72836

8.1 · HIGH

FileBrowser before 2.63.19 does not account for case-insensitive filesystems when checking home directory ownership during self-registration.

Published Aug 14, 2026CWE-178EPSS 0.55%

Overview

CVE-2026-72836 is a high-severity vulnerability. It was published on August 14, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

FileBrowser before 2.63.19 does not account for case-insensitive filesystems when checking home directory ownership during self-registration. When Signup and CreateUserDir are enabled and FileBrowser's root is on a case-insensitive filesystem (confirmed on Windows/NTFS), two self-registered usernames that differ only in letter case (e.g., CaseVictim and casevictim) are stored as distinct accounts but resolve to the same physical home directory, because the scope-ownership check compares the persisted scope as an exact case-sensitive string. A second registrant can therefore read, overwrite, and delete another account's files through authenticated HTTP endpoints, without needing an existing account or victim interaction.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/filebrowser/filebrowser/commit/fe7efb2e6afe66774cd86a5b0a03033bd514d0c0GitHubgithub.com/filebrowser/filebrowser/security/advisories/GHSA-576v-w77m-gr84Refwww.vulncheck.com/advisories/filebrowser-before-case-sensitivity-authentication-bypassGitHubgithub.com/filebrowser/filebrowser/security/advisories/GHSA-576v-w77m-gr84

How CyberStrike helps

Frequently asked questions

What is CVE-2026-72836?

CVE-2026-72836 is a high-severity vulnerability. It was published on August 14, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-72836?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-72836?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-72836?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-72836 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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