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CVE-2026-34528

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

Published: Apr 1, 2026Updated: Apr 6, 2026 Sources: CVE List NVDCWE-269
NVD MITRE
8.1CVSSHIGH
EPSS Score
0.7%
Top 53.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only

Description

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-269

Affected Products

filebrowserfilebrowser
On-prem
Web & CMS Plugins / site-builder
filebrowseross-projectWeb & CMS Pluginsaka filebrowser

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Workaround Available

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://github.com/filebrowser/filebrowser/security/advisories/GHSA-x8jc-jvqm-pm3f
github.com
https://github.com/filebrowser/filebrowser/releases/tag/v2.62.2
github.com

Timeline

Published
Apr 1, 2026
Last Updated
Apr 6, 2026

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