What’s Vulnerable › Vulnerabilities

CVE-2026-90927: filebrowser through 2.63.23 Denial of Service via unbounded WebSocket message

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-24
• Weakness: CWE-400

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.

Affected products

• filebrowser: through 2.63.23

References

• https://github.com/filebrowser/filebrowser/security/advisories/GHSA-39cx-23x9-5c8p
• https://www.vulncheck.com/advisories/filebrowser-through-2.63.23-denial-of-service-via-unbounded-websocket-message
• https://github.com/filebrowser/filebrowser/security/advisories/GHSA-39cx-23x9-5c8p

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