Vulnerability in Flowise (CVE-2026-73603)
Summary
Vulnerability in Flowise (CVE-2026-73603). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
Summary
The /api/v1/text-to-speech/generate endpoint is whitelisted (requires no authentication) and accepts any chatflowId without checking whether the referenced chatflow is public. An unauthenticated attacker who knows a valid chatflow UUID can abuse that chatflow's TTS credential (OpenAI or ElevenLabs API key) to generate unlimited text-to-speech audio, incurring costs on the chatflow owner's account.
Details
The TTS generateTextToSpeech controller at packages/server/src/controllers/text-to-speech/index.ts:10-171 is whitelisted at packages/server/src/utils/constants.ts:41:
'/api/v1/text-to-speech/generate',
When a chatflowId is provided and the user is not authenticated (no req.user), the controller falls back to fetching the chatflow without workspace scoping:
// packages/server/src/controllers/text-to-speech/index.ts:36-42
if (workspaceId) {
chatflow = await chatflowsService.getChatflowById(chatflowId, workspaceId)
} else {
// Fallback: get workspaceId from chatflow when req.user.activeWorkspaceId is not set
chatflow = await chatflowsService.getChatflowById(chatflowId) // NO isPublic check
workspaceId = chatflow.workspaceId
}
The getChatflowById function at packages/server/src/services/chatflows/index.ts:247-272 fetches any chatflow by ID when workspaceId is not provided:
const dbResponse = await appServer.AppDataSource.getRepository(ChatFlow).findOne({
where: {…
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-73603 has been found in Flowise.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Flowise CVE-2026-73603" on the vendor's site.
CVE-2026-73603 (Flowise) — CWE-862 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-862) exists in Flowise.
Check the vendor advisory for the affected versions of Flowise.
Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Flowise' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'Flowise' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
Flowiseを grep し、稼働しているサービス・バージョンを把握する。 -
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- package github.com
- web github.com
- web nvd.nist.gov
- web vulncheck.com
- web github.com
- web github.com
- web github.com
- web github.com