CVE-2026-42863Public exploitNetwork attack vector

Cross-workspace chatflow takeover via mass assignment

Published Jun 8, 2026 · Updated Jun 8, 2026

Mass assignment in Flowise before 3.1.2 allows remote authenticated users to reassign chatflows and alter protected settings. The PUT /api/v1/chatflows/{chatflowId} handler directly maps extra JSON fields into the database entity without a DTO allowlist or workspace authorization check. Low-privileged access to a multi-workspace deployment is enough to move chatflows across tenants or change visibility and deployment state.

CVSS severity7.6
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Mass assignment in Flowise before 3.1.2 allows remote authenticated users to reassign chatflows and alter protected settings. The PUT /api/v1/chatflows/{chatflowId} handler directly maps extra JSON fields into the database entity without a DTO allowlist or workspace authorization check. Low-privileged access to a multi-workspace deployment is enough to move chatflows across tenants or change visibility and deployment state.

The record

CVE
CVE-2026-42863
Published
Jun 8, 2026
Updated
Jun 8, 2026
Vendor
FlowiseAI
Product
Flowise
Classifications
CWE-639, CWE-284, CWE-915, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 3.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FlowiseAI · Flowiseversion=< 3.1.2

Published CVSS scores

8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
7.6GitHub, Inc.CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
CWE-284Improper Access Control
CWE-915Improperly Controlled Modification of Dynamically-Determined Object Attributes
T1565.001Stored Data Manipulation

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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