CVE-2026-58057 - Flowise - Custom MCP Environment Variable Denylist Bypass via Case Sensitivity

CVE-2026-58057 - Flowise - Custom MCP Environment Variable Denylist Bypass via Case Sensitivity

https://cvefeed.io/rssfeed/latest.atom / Sun, 06/28/2026 - 07:02
CVE ID :CVE-2026-58057
Published : June 28, 2026, 1:32 a.m. | 3 hours, 9 minutes ago
Description :Flowise before 3.1.3 validates Custom MCP stdio environment variables against a denylist using a case-sensitive comparison, so on Windows, where environment names are case-insensitive, supplying 'node_options' bypasses the NODE_OPTIONS denylist entry. An authenticated user who can configure a Custom MCP node can thereby inject NODE_OPTIONS --require and execute arbitrary code in the Flowise server context.
Severity: 5.0 | MEDIUM
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