CVE-2026-41279

The text-to-speech generation endpoint (POST /api/v1/text-to-speech/generate) is whitelisted (no auth) and accepts a credentialId directly in the request body. When called without a chatflowId, the endpoint uses the provided credentialId to decrypt the stored credential (e.g., OpenAI or ElevenLabs API key) and generate speech.

Root Cause

// packages/server/src/controllers/text-to-speech/index.ts:58-64
} else {
    // Use TTS config from request body
    provider = bodyProvider
    credentialId = bodyCredentialId  // ← attacker-controlled credential ID
    voice = bodyVoice
    model = bodyModel
}

Docker Validation

POST /api/v1/text-to-speech/generate with arbitrary credentialId in body: endpoint processes request, sends SSE tts_start event, only fails when credential doesn't exist, proves code path runs without authentication.

References

• packages/server/src/controllers/text-to-speech/index.ts lines 10-162
• packages/server/src/utils/constants.ts line 41 (whitelist entry)

Credits

• Shinobi Security - https://github.com/shinobisecurity

• Use victim's API keys (OpenAI, ElevenLabs, Azure, Google) without authorization
• Burn API credits on the victim's account
• Generate unlimited speech content at victim's expense
• Combined with credential ID leak from Finding 2, this is trivially exploitable

CVE-2026-41279 has a CVSS score of 7.5 (High). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (3.1.0); upgrading removes the vulnerable code path.

Kodem intelligence

Remove the TTS endpoint from WHITELIST_URLS or validate that the credential belongs to the chatflow being used:

// Only allow credentialId when it matches the chatflow's TTS configuration
if (!chatflowId) {
    return res.status(401).json({ message: 'Authentication required' })
}

1. What is CVE-2026-41279? CVE-2026-41279 is a high-severity security vulnerability in flowise (npm), affecting versions <= 3.0.13. It is fixed in 3.1.0.
2. How severe is CVE-2026-41279? CVE-2026-41279 has a CVSS score of 7.5 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of flowise are affected by CVE-2026-41279? flowise (npm) versions <= 3.0.13 is affected.
4. Is there a fix for CVE-2026-41279? Yes. CVE-2026-41279 is fixed in 3.1.0. Upgrade to this version or later.
5. Is CVE-2026-41279 exploitable, and should I be worried? Whether CVE-2026-41279 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-41279 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-41279? Upgrade flowise to 3.1.0 or later.