Vulnerability Details CVE-2026-56277
Flowise before 3.1.2 sets Access-Control-Allow-Origin to a hardcoded wildcard (*) on its text-to-speech (TTS) generation endpoint (packages/server/src/controllers/text-to-speech/index.ts), independent of the server's configured CORS policy. This bypasses the server's otherwise restrictive default CORS configuration (getCorsOptions()) and allows any webpage to make cross-origin requests that trigger TTS generation using stored credentials, enabling drive-by cross-origin credential abuse.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 8.0%
CVSS Severity
CVSS v3 Score 6.5
Products affected by CVE-2026-56277
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cpe:2.3:a:flowiseai:flowise:-
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cpe:2.3:a:flowiseai:flowise:1.0.0
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cpe:2.3:a:flowiseai:flowise:1.0.1
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cpe:2.3:a:flowiseai:flowise:1.1.0
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cpe:2.3:a:flowiseai:flowise:1.1.1
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cpe:2.3:a:flowiseai:flowise:1.2.1
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cpe:2.3:a:flowiseai:flowise:1.2.10
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cpe:2.3:a:flowiseai:flowise:1.2.11
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cpe:2.3:a:flowiseai:flowise:1.2.12
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cpe:2.3:a:flowiseai:flowise:1.2.13
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cpe:2.3:a:flowiseai:flowise:1.2.14
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cpe:2.3:a:flowiseai:flowise:1.2.15
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cpe:2.3:a:flowiseai:flowise:1.2.16
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cpe:2.3:a:flowiseai:flowise:1.2.2
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cpe:2.3:a:flowiseai:flowise:1.2.3
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cpe:2.3:a:flowiseai:flowise:1.2.4
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cpe:2.3:a:flowiseai:flowise:1.2.5
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cpe:2.3:a:flowiseai:flowise:1.2.6
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cpe:2.3:a:flowiseai:flowise:1.2.7
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cpe:2.3:a:flowiseai:flowise:1.2.8
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cpe:2.3:a:flowiseai:flowise:1.2.9
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cpe:2.3:a:flowiseai:flowise:1.3.0
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cpe:2.3:a:flowiseai:flowise:1.3.1
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cpe:2.3:a:flowiseai:flowise:1.3.2
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cpe:2.3:a:flowiseai:flowise:1.3.3
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cpe:2.3:a:flowiseai:flowise:1.3.4
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cpe:2.3:a:flowiseai:flowise:1.3.5
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cpe:2.3:a:flowiseai:flowise:1.3.6
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cpe:2.3:a:flowiseai:flowise:1.3.7
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cpe:2.3:a:flowiseai:flowise:1.3.8
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cpe:2.3:a:flowiseai:flowise:1.3.9
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cpe:2.3:a:flowiseai:flowise:1.4.0
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cpe:2.3:a:flowiseai:flowise:1.4.1
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cpe:2.3:a:flowiseai:flowise:1.4.10
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cpe:2.3:a:flowiseai:flowise:1.4.11
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cpe:2.3:a:flowiseai:flowise:1.4.12
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cpe:2.3:a:flowiseai:flowise:1.4.2
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cpe:2.3:a:flowiseai:flowise:1.4.3
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cpe:2.3:a:flowiseai:flowise:1.4.4
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cpe:2.3:a:flowiseai:flowise:1.4.5
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cpe:2.3:a:flowiseai:flowise:1.4.6
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cpe:2.3:a:flowiseai:flowise:1.4.7
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cpe:2.3:a:flowiseai:flowise:1.4.8
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cpe:2.3:a:flowiseai:flowise:1.4.9
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cpe:2.3:a:flowiseai:flowise:1.5.0
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cpe:2.3:a:flowiseai:flowise:1.5.1
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cpe:2.3:a:flowiseai:flowise:1.6.0
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cpe:2.3:a:flowiseai:flowise:1.6.1
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cpe:2.3:a:flowiseai:flowise:1.6.2
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cpe:2.3:a:flowiseai:flowise:1.6.3
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cpe:2.3:a:flowiseai:flowise:1.6.4
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cpe:2.3:a:flowiseai:flowise:1.6.5
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cpe:2.3:a:flowiseai:flowise:1.6.6
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cpe:2.3:a:flowiseai:flowise:1.7.0
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cpe:2.3:a:flowiseai:flowise:1.7.1
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cpe:2.3:a:flowiseai:flowise:1.7.2
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cpe:2.3:a:flowiseai:flowise:1.8.0
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cpe:2.3:a:flowiseai:flowise:1.8.1
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cpe:2.3:a:flowiseai:flowise:1.8.2
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cpe:2.3:a:flowiseai:flowise:1.8.3
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cpe:2.3:a:flowiseai:flowise:1.8.4
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cpe:2.3:a:flowiseai:flowise:2.0.0
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cpe:2.3:a:flowiseai:flowise:2.0.1
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cpe:2.3:a:flowiseai:flowise:2.0.2
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cpe:2.3:a:flowiseai:flowise:2.0.3
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cpe:2.3:a:flowiseai:flowise:2.0.4
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cpe:2.3:a:flowiseai:flowise:2.0.5
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cpe:2.3:a:flowiseai:flowise:2.0.6
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cpe:2.3:a:flowiseai:flowise:2.0.7
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cpe:2.3:a:flowiseai:flowise:2.1.0
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cpe:2.3:a:flowiseai:flowise:2.1.1
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cpe:2.3:a:flowiseai:flowise:2.1.2
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cpe:2.3:a:flowiseai:flowise:2.1.3
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cpe:2.3:a:flowiseai:flowise:2.1.4
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cpe:2.3:a:flowiseai:flowise:2.1.5
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cpe:2.3:a:flowiseai:flowise:2.2.0
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cpe:2.3:a:flowiseai:flowise:2.2.1
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cpe:2.3:a:flowiseai:flowise:2.2.2
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cpe:2.3:a:flowiseai:flowise:2.2.3
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cpe:2.3:a:flowiseai:flowise:2.2.4
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cpe:2.3:a:flowiseai:flowise:2.2.5
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cpe:2.3:a:flowiseai:flowise:2.2.6
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cpe:2.3:a:flowiseai:flowise:2.2.7
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cpe:2.3:a:flowiseai:flowise:2.2.8
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cpe:2.3:a:flowiseai:flowise:3.0.0
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cpe:2.3:a:flowiseai:flowise:3.0.1
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cpe:2.3:a:flowiseai:flowise:3.0.10
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cpe:2.3:a:flowiseai:flowise:3.0.11
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cpe:2.3:a:flowiseai:flowise:3.0.12
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cpe:2.3:a:flowiseai:flowise:3.0.13
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cpe:2.3:a:flowiseai:flowise:3.0.2
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cpe:2.3:a:flowiseai:flowise:3.0.3
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cpe:2.3:a:flowiseai:flowise:3.0.4
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cpe:2.3:a:flowiseai:flowise:3.0.5
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cpe:2.3:a:flowiseai:flowise:3.0.6
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cpe:2.3:a:flowiseai:flowise:3.0.7
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cpe:2.3:a:flowiseai:flowise:3.0.8
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cpe:2.3:a:flowiseai:flowise:3.0.9
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cpe:2.3:a:flowiseai:flowise:3.1.0
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cpe:2.3:a:flowiseai:flowise:3.1.1