mediumVulnerability

GHSA-m837-xvxr-vqwg

### Summary The TTS generation endpoint sets `Access-Control-Allow-Origin: *` as a hardcoded response header, independent of the server's CORS configuration. This enables any webpage to make cross-origin requests to generate speech using stored credentials. ### Root Cause ```typescript // packages/server/src/controllers/text-to-speech/index.ts:83 res.setHeader('Access-Control-Allow-Origin', '*') res.setHeader('Access-Control-Allow-Headers', 'Cache-Control') ``` ### Impact - Cross-origin credential abuse — any webpage can trigger TTS using stored credentials - Bypasses the server's CORS policy (`getCorsOptions()`) which is otherwise restrictive by default - Combined with Finding 3 (TTS credential abuse), enables drive-by credential abuse via malicious webpages ### Suggested Fix Remove the hardcoded CORS wildcard and let the server's CORS middleware handle the headers: ```typescript // Remove these lines: // res.setHeader('Access-Control-Allow-Origin', '*') // res.setHeader('Access-Control-Allow-Headers', 'Cache-Control') ``` --- ## References - `packages/server/src/controllers/text-to-speech/index.ts` line 83

Properties

ghsa_id
GHSA-m837-xvxr-vqwg
severity
medium
summary
Flowise: Hardcoded CORS wildcard on TTS endpoint enables cross-origin credential abuse from any webpage
cve_id
GHSA-m837-xvxr-vqwg
is_ghsa_only
true
ghsa_published
2026-05-20T15:38:02Z
source_url
https://github.com/advisories/GHSA-m837-xvxr-vqwg
ghsa_updated
2026-05-20T15:38:05Z

Related Entities (4)

VULNERABLE_TO (1)

[Software]npm/flowise

AFFECTS (1)

[Software]npm/flowise

HAS_WEAKNESS (1)

[Weakness]Permissive Cross-domain Security Policy with Untrusted Domains

REPORTED_BY (1)

[Source]GitHub Advisory Database

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