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CVE-2026-90927

filebrowser through 2.63.23 Denial of Service via unbounded WebSocket message

CVSS 4.0 7.1 HIGHCVSS 3.1 6.5 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-90927

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-90927

Published

filebrowser

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "filebrowser",
                    "product": "filebrowser",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:golang/github.com/filebrowser/filebrowser/v2",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThanOrEqual": "2.63.23"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON