CVE-2026-44542: FileBrowser Quantum is a free, self-hosted, web-based file manager

Q: How do I fix CVE-2026-44542?

filebrowser quantum: upgrade to 1.3.1, 1.3.9. Exact commands for each OS are on this page.

Q: Is CVE-2026-44542 being exploited?

CVE-2026-44542 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-44542 affect?

CVE-2026-44542 affects filebrowser quantum. Severity is critical (CVSS 9.1). FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to 1.3.1-stable and 1.3.9-beta, attacker-controlled path input is joined with a trusted base path prior to sanitization, allowing traversal sequences (e.g., ../) to e

Q: How urgent is CVE-2026-44542?

Priority 53/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-44542 is a critical-severity flaw (CVSS 9.1) affecting filebrowser quantum. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to 1.3.1-stable and 1.3.9-beta, attacker-controlled path input is joined with a trusted base path prior to sanitization, allowing traversal sequences (e.g., ../) to escape the intended shared directory. As a result, an unauthenticated attacker possessing a valid public share hash with delete permissions enabled can delete arbitrary files outside the shared directory within

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-05-14
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: gtsteffaniak

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-14 18:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

gtsteffaniak filebrowser quantum UPGRADE

Affected: < 1.3.1 · < 1.3.9

Fixed in: 1.3.1, 1.3.9

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy filebrowser-quantum || rpm -q filebrowser-quantum || filebrowser-quantum --version

2. UPGRADE to 1.3.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade filebrowser-quantum

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade filebrowser-quantum

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Go · github.com/gtsteffaniak/filebrowser · FIXED · 0.0.0-20260501183844-112740bdd41d · vulnerable: < 0.0.0-20260501183844-112740bdd41d · source

go get github.com/gtsteffaniak/filebrowser@v0.0.0-20260501183844-112740bdd41d go list -m github.com/gtsteffaniak/filebrowser

Fedora 46 · rust-opendal-core · FIXED · 0.59.1-2.fc46 · FEDORA-2026-4607543819 · source

sudo dnf upgrade --advisory=FEDORA-2026-4607543819

Fedora ELN · velocitty · FIXED · 1.0.3-2.eln159 · FEDORA-2026-edae8cd295 · source

sudo dnf upgrade --advisory=FEDORA-2026-edae8cd295

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-fwj3-42wh-8673

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-44542?

filebrowser quantum: upgrade to 1.3.1, 1.3.9. Exact commands for each OS are on this page.

Is CVE-2026-44542 being exploited?

CVE-2026-44542 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-44542 affect?

CVE-2026-44542 affects filebrowser quantum. Severity is critical (CVSS 9.1). FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to 1.3.1-stable and 1.3.9-beta, attacker-controlled path input is joined with a trusted base path prior to sanitization, allowing traversal sequences (e.g., ../) to e

How urgent is CVE-2026-44542?

Priority 53/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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