CVE-2026-72839Public exploitNetwork attack vector

Unauthenticated full file access via inherited signup defaults

Published Aug 13, 2026 · Updated Aug 14, 2026

Privilege escalation in File Browser 2.63.16 and earlier allows remote attackers to read, modify, and delete all managed files. The signupHandler applies the full default permission set and, when CreateUserDir is false, normalizes the inherited default scope to the server root. Exploitation requires self-registration to be enabled; the factory-default CreateUserDir setting then grants each registrant access to every file the server manages.

CVSS severity9.3
Critical
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in File Browser 2.63.16 and earlier allows remote attackers to read, modify, and delete all managed files. The signupHandler applies the full default permission set and, when CreateUserDir is false, normalizes the inherited default scope to the server root. Exploitation requires self-registration to be enabled; the factory-default CreateUserDir setting then grants each registrant access to every file the server manages.

The record

CVE
CVE-2026-72839
Published
Aug 13, 2026
Updated
Aug 14, 2026
Vendor
File Browser
Product
File Browser
Classifications
CWE-1188, CWE-266, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.63.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

File Browser · File Browserversion=0 <=2.63.16

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1188Initialization of a Resource with an Insecure Default
CWE-266Incorrect Privilege Assignment
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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