High severity · published Aug 14, 2026
CVE-2026-72837
File Browser before 2.63.20 Privilege Escalation via Proxy Authentication
8.8
CVSS
0.6%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
filebrowser · filebrowser
before 2.63.20 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-72837
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-72837
github.com
https://github.com/filebrowser/filebrowser/security/advisories/GHSA-j7jh-37pf-mf8h
www.vulncheck.com
https://www.vulncheck.com/advisories/file-browser-before-privilege-escalation-via-proxy-authentication
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