CVE-2024-36421Public exploitNetwork attack vector

Information disclosure via unrestricted cross-origin requests

Published Jul 1, 2024 · Updated Aug 2, 2024

Origin validation error in Flowise 1.4.3 and earlier allows remote attackers to read sensitive data through cross-origin requests. The server registers the Express cors() middleware without an origin allowlist, returning Access-Control-Allow-Origin for any requesting site. Default unauthenticated deployments expose Flowise responses to attacker-controlled origins, and chaining the flaw with path injection reads server files.

CVSS severity7.5
High
EPSS probability8.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation error in Flowise 1.4.3 and earlier allows remote attackers to read sensitive data through cross-origin requests. The server registers the Express cors() middleware without an origin allowlist, returning Access-Control-Allow-Origin for any requesting site. Default unauthenticated deployments expose Flowise responses to attacker-controlled origins, and chaining the flaw with path injection reads server files.

The record

CVE
CVE-2024-36421
Published
Jul 1, 2024
Updated
Aug 2, 2024
Vendor
FlowiseAI
Product
Flowise
Classifications
CWE-346, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.4.3
  2. Affected versionversion=<= 1.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FlowiseAI · Flowiseversion=0 <=1.4.3; version=<= 1.4.3

Published CVSS scores

8.7GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-346Origin Validation Error
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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