CVE-2026-90927

Medium

Description

filebrowser through 2.63.23 fails to limit WebSocket message size in the /api/command handler before checking permissions, allowing authenticated users to buffer arbitrarily large messages. Attackers can send oversized WebSocket messages to exhaust server heap memory and cause denial of service regardless of EnableExec setting or Execute permission.

SeverityMedium

CVSS6.5

Exploit probability—

ProductFilebrowser

PublishedSep 14, 2026

First seenSep 14, 2026

Weakness typeCWE-400Uncontrolled resource consumption

How to fix

Vendor advisories

github.com/filebrowser/filebrowser/security/advisories/GHSA-39cx-23x9-5c8p

Affected products

Product	Affected versions	Fixed in
filebrowser filebrowser	v ≤ 2.63.23	—

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