Description
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.
References (2)
Core 2
Core References
Vendor Advisory vendor-advisory
GitHub Security Advisory (GHSA-m837-xvxr-vqwg)
https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m837-xvxr-vqwg
Third Party Advisory third-party-advisory
VulnCheck Advisory: Flowise - Hardcoded CORS Wildcard in TTS Endpoint
https://www.vulncheck.com/advisories/flowise-hardcoded-cors-wildcard-in-tts-endpoint
Scores
CVSS v3
6.5
EPSS
0.0014
EPSS Percentile
3.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-346
Status
published
Products (3)
Flowise/Flowise
< 3.1.2
Flowise/Flowise
3.1.2
flowiseai/flowise
< 3.1.2
Published
Jun 30, 2026
Tracked Since
Jul 01, 2026