CVE-2026-90927CWE-400denial-of-service

CVE-2026-90927

Medium · published September 14, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
36.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
7.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00436 · 36.8th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-09-14T17:19Z
References (3)
https://github.com/filebrowser/filebrowser/security/advisories/GHSA-39cx-23x9-5c8p · [email protected]https://www.vulncheck.com/advisories/filebrowser-through-2.63.23-denial-of-service-via-unbounded-websocket-message · [email protected]https://github.com/filebrowser/filebrowser/security/advisories/GHSA-39cx-23x9-5c8p · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 14 SEP 12:48Z
    filebrowser through 2.63.23 Denial of Service via unbounded WebSocket message
    cvelistv5