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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.

FlowiseAI Flowise是FlowiseAI公司开源的一款可视化编排语言模型应用流程的工具。 FlowiseAI Flowise 3.1.4之前版本存在授权问题漏洞，该漏洞源于/api/v1/text-to-speech/abort端点未对用户提供的chatflowId和chatId进行所有权验证，可能导致未经验证的攻击者终止任意用户的活动chatflow预测，造成针对性服务中断。

CVSS 6.3 · Medium EPSS 0.48% · P42

Possible ATT&CK Techniques 1 AI

T1499.001 · OS Exhaustion Flood

Affected Version Matrix 2

VendorProduct Version RangeStatus
FlowiseAI Flowise < 3.1.4 affected
3.1.4 unaffected
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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
Vulnerability Title
FlowiseAI Flowise 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FlowiseAI Flowise是FlowiseAI公司开源的一款可视化编排语言模型应用流程的工具。 FlowiseAI Flowise 3.1.4之前版本存在授权问题漏洞，该漏洞源于/api/v1/text-to-speech/abort端点未对用户提供的chatflowId和chatId进行所有权验证，可能导致未经验证的攻击者终止任意用户的活动chatflow预测，造成针对性服务中断。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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