CVE-2026-72837

HIGH 8.8

File Browser before 2.63.20 Privilege Escalation via Proxy Authentication

CVSS Score

8.8

EPSS Score

0.0%

EPSS Percentile

0th

File Browser versions before 2.63.20 fail to honor the createUserDir isolation in proxy and hook authentication auto-provisioning paths. Attackers with valid upstream-authenticated credentials can read, modify, delete, and share files belonging to other users by exploiting the server root scope assignment.

CWE	CWE-284
Vendor	filebrowser
Product	filebrowser
Published	Aug 14, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

filebrowser / filebrowser

0 < 2.63.20

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/filebrowser/filebrowser/security/advisories/GHSA-j7jh-37pf-mf8h vulncheck.com: https://www.vulncheck.com/advisories/file-browser-before-privilege-escalation-via-proxy-authentication

Credits

🔍 thesmartshadow 🔍 B1gN0Se hacdias