TI-2026-26777 Aliases CVE-2026-34528 GHSA-x8jc-jvqm-pm3f

File Browser's Signup Grants Execution Permissions When Default Permissions Includes Execution

HIGH 76CWE-269Published 2026-04-01 · Updated 2026-04-02

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Privilege escalation
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-269.

Summary

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to version 2.62.2, the signupHandler in File Browser applies default user permissions via d.settings.Defaults.Apply(user), then strips only Admin. The Execute permission and Commands list from the default user template are not stripped. When an administrator has enabled signup, server-side execution, and set Execute=true in the default user template, any unauthenticated user who self-registers inherits shell execution capabilities and can run arbitrary commands on the server. This issue has been patched in version 2.62.2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.0068 52nd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed filebrowser (filebrowser): 2.62.2github.com/filebrowser/filebrowser/v2 (Go): 2.62.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
filebrowser	filebrowser	before 2.62.2	2.62.2	Patch available	CNA
—	github.com/filebrowser/filebrowser/v2 (Go)	before 2.62.2	2.62.2	Patch available	GHSA-x8jc-jvqm-pm3f

filebrowser Vendorfilebrowser Affected before 2.62.2 Fixed in 2.62.2 Patch available CNA
github.com/filebrowser/filebrowser/v2 (Go) Vendor— Affected before 2.62.2 Fixed in 2.62.2 Patch available GHSA-x8jc-jvqm-pm3f

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:filebrowser:filebrowser::::::::	before 2.62.2	Vulnerable	filebrowser

cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:* Versions before 2.62.2 Vulnerable ·filebrowser

Remediation

Fix · CNA filebrowser (filebrowser) Fixed in 2.62.2
Fix · GHSA-x8jc-jvqm-pm3f github.com/filebrowser/filebrowser/v2 (Go) Fixed in 2.62.2 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-34528
2026-10-03 Alias added: GHSA-x8jc-jvqm-pm3f
2026-10-07 EPSS moved to the 50th–90th percentile

References

Exploit 1

https://github.com/filebrowser/filebrowser/security/advisories/GHSA-x8jc-jvqm-pm3f

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-34528

Other 2

TI-2026-25251 File Browser Self Registration Grants Any User Admin Access When Default Permissions Include Admin CVSS 4.0CRITICAL 10.0
TI-2026-23305 File Browser: TUS Delete Endpoint Bypasses Delete Permission Check CVSS 3.1CRITICAL 9.1
TI-2025-33000 File Browser vulnerable to command execution allowlist bypass CVSS 3.1HIGH 8.1
TI-2026-23759 FileBrowser Quantum: Stored XSS in public share page via unsanitized share metadata (text/template misuse) CVSS 3.1HIGH 8.9
TI-2023-20699 A cross-site scripting (XSS) vulnerability in FileBrowser before v2.23.0 allows an… CVSS 3.1CRITICAL 9.0
TI-2026-27710 File Browser: Proxy auth auto-provisioned users inherit Execute permission and Commands CVSS 3.1HIGH 8.8

See all 31 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences