CVE-2026-72837Public exploitNetwork attack vector

Authenticated cross-user file takeover via inherited root scope

Published Aug 14, 2026 · Updated Aug 14, 2026

Improper access control in File Browser before 2.63.20 allows remote authenticated users to access other users' files via proxy or hook auth. Proxy and hook auto-provisioning pass the default scope of "." into MakeUserDir, which normalizes it to the server root instead of deriving a per-user directory. The flaw requires createUserDir with the default scope and a valid upstream identity, granting read, write, delete, rename, and share access across the root.

CVSS severity8.7
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in File Browser before 2.63.20 allows remote authenticated users to access other users' files via proxy or hook auth. Proxy and hook auto-provisioning pass the default scope of "." into MakeUserDir, which normalizes it to the server root instead of deriving a per-user directory. The flaw requires createUserDir with the default scope and a valid upstream identity, granting read, write, delete, rename, and share access across the root.

The record

CVE
CVE-2026-72837
Published
Aug 14, 2026
Updated
Aug 14, 2026
Vendor
File Browser
Product
File Browser
Classifications
CWE-284, CWE-863, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 14, 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 <2.63.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

File Browser · File Browserversion=0 <2.63.20

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-863Incorrect Authorization
T1078Valid Accounts

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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