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CVE-2026-90535— Flowise before 3.1.4 Denial of Service via text-to-speech/abort

Quick assessment

Affected
FlowiseAI Flowise
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Flowise 3.1.4 版本之前的版本中存在一个未经身份验证的服务拒绝（DoS）漏洞，位于 端点。该端点在接收用户提供的 和 时未进行所有权验证。攻击者可以通过提交包含已知 chatflow 和 chat 标识符的请求，终止任何用户的活跃 chatflow 预测，从而造成针对性的服务中断。

CVSS 6.3 · Medium

Possible ATT&CK Techniques 1 AI

T1499.001 · OS Exhaustion Flood
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I. Basic Information for CVE-2026-90535

Vulnerability Information
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Vulnerability Title
Flowise before 3.1.4 Denial of Service via text-to-speech/abort
Source: CVE Program / CVE List V5
Vulnerability Description
Flowise versions before 3.1.4 contain an unauthenticated denial of service vulnerability in the /api/v1/text-to-speech/abort endpoint that accepts user-supplied chatflowId and chatId without ownership verification. Attackers can terminate active chatflow predictions for any user by submitting requests with known chatflow and chat identifiers, causing targeted service disruption.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FlowiseAI Flowise 0 ~ 3.1.4 -

II. Public POCs for CVE-2026-90535

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III. Intelligence Information for CVE-2026-90535

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Vendor Advisories for CVE-2026-90535 (2)

Same Patch Batch · FlowiseAI · 2026-09-12 · 3 CVEs total

CVE-2026-90534 6.1 MEDIUM Flowise before 3.1.4 Cross-Workspace Credential IDOR via node-load-method
CVE-2026-90533 6.0 MEDIUM Flowise before 3.1.4 Broken Access Control via organizationuser

IV. Related Vulnerabilities

Same product: Flowise
Same vendor: FlowiseAI
Same weakness: CWE-862

V. Comments for CVE-2026-90535

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