CVE-2026-90535

⚠️ high

Summary

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.

CVSS Score

7.5

High

EPSS Score

0.3

Exploit Probability

Published Date

2026-09-12

First Seen: 2026-09-13

📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 67.8% of all 358,566 vulnerabilities in our database.

#115,475

Above average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: Sep 14, 2026

🔍 Exploitation Status

Poc

Proof-of-concept available

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Partial

Limited system impact

🏆 Discovered By

offset (reporter)

SSVC data provided by CISA

Last Modified 2026-09-15

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS Vector 4.0

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CWE IDs (Weakness Types)

CWE-862

📦 Affected Products 1

Vendor	Product	Status	Affected Versions
flowiseai	flowise	Affected	< 3.1.4

🔗 References 2

https://github.com/FlowiseAI/Flowise/security/adviso...

Exploit Vendor Advisory

https://www.vulncheck.com/advisories/flowise-before-...

Third Party Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-90580	🔶 medium	6.3	0.2	A vulnerability was found in FlowiseAI Flowise up to 3.0.2. This vulnerability affects the function axios.post of the fi...	2026-09-13
CVE-2026-90533	🔶 medium	6.5	0.2	Flowise before 3.1.4 contains a broken access control vulnerability in GET /api/v1/organizationuser that allows any auth...	2026-09-12
CVE-2026-90534	🔶 medium	6.5	0.2	Flowise is a low-code platform for building LLM applications. In versions up to and including 3.1.3, the POST /api/v1/no...	2026-09-12
CVE-2026-52098	⛔ critical	9.8	0.8	An issue in Flowise 3.1.2 allows a remote attacker to execute arbitrary code via the /api/v1/prediction/<flowId> endpoin...	2026-09-10
CVE-2026-73483	⚠️ high	8.8	0.6	Flowise (packages flowise and flowise-components) in versions <= 3.1.2 contain a sandbox escape in the vm2/@flowiseai/no...	2026-08-13
CVE-2026-73484	⚠️ high	8.1	0.4	Flowise before 3.1.3 contains a sandbox escape vulnerability in pythonCodeValidator.ts that fails to block native Pandas...	2026-08-13

These CVEs affect the same products