CVE-2026-54910Public exploitNetwork attack vector

Authenticated arbitrary file read via subtitle traversal

Published Jul 20, 2026 · Updated Jul 20, 2026

Path traversal in FileBrowser Quantum before 1.4.3-beta allows remote authenticated users to read arbitrary text files through the subtitle API. In subtitlesHandler, raw path reaches idx.GetRealPath without SanitizeUserPath, while raw name is joined to parentDir without removing directory components. Any authenticated account can escape its storage scope and retrieve UTF-8 text files under 50 MB that the server process can read.

CVSS severity7.7
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in FileBrowser Quantum before 1.4.3-beta allows remote authenticated users to read arbitrary text files through the subtitle API. In subtitlesHandler, raw path reaches idx.GetRealPath without SanitizeUserPath, while raw name is joined to parentDir without removing directory components. Any authenticated account can escape its storage scope and retrieve UTF-8 text files under 50 MB that the server process can read.

The record

CVE
CVE-2026-54910
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
Graham Steffaniak
Product
FileBrowser Quantum
Classifications
CWE-22, CWE-23, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 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=< 1.4.3-beta

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Graham Steffaniak · FileBrowser Quantumversion=< 1.4.3-beta

Published CVSS scores

7.7GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-23Relative Path Traversal
T1005Data from Local System

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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