CVE-2026-54091Public exploitNetwork attack vector

Unauthenticated file disclosure via rebased rule paths

Published Jun 25, 2026 · Updated Jun 25, 2026

Incorrect authorization in File Browser before 2.63.6 allows remote attackers to read rule-blocked files through public directory shares. Public share handlers rebase the owner's filesystem to the shared directory, but d.Check compares rebased paths with rules rooted at the owner's original scope. Exploitation requires a known, unprotected directory-share URL and a blocked descendant beneath that shared directory.

CVSS severity7.5
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in File Browser before 2.63.6 allows remote attackers to read rule-blocked files through public directory shares. Public share handlers rebase the owner's filesystem to the shared directory, but d.Check compares rebased paths with rules rooted at the owner's original scope. Exploitation requires a known, unprotected directory-share URL and a blocked descendant beneath that shared directory.

The record

CVE
CVE-2026-54091
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
File Browser Contributors
Product
File Browser
Classifications
CWE-863, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=< 2.63.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

File Browser Contributors · File Browserversion=< 2.63.6

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
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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