CVE-2026-41277Public exploitNetwork attack vector

Cross-workspace object takeover via implicit UPSERT

Published Apr 23, 2026 · Updated Apr 23, 2026

Mass assignment in Flowise before 3.1.0 allows remote authenticated users to overwrite DocumentStore objects through the create endpoint. The endpoint maps the entire request body, including a client-supplied id, into the entity, and repository.save() updates an existing primary key. Cross-workspace takeover requires a multi-workspace deployment and a valid DocumentStore UUID from another workspace, enabling unauthorized modification or reassignment.

CVSS severity7.6
High
EPSS probability3.11%
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 3.1.0 allows remote authenticated users to overwrite DocumentStore objects through the create endpoint. The endpoint maps the entire request body, including a client-supplied id, into the entity, and repository.save() updates an existing primary key. Cross-workspace takeover requires a multi-workspace deployment and a valid DocumentStore UUID from another workspace, enabling unauthorized modification or reassignment.

The record

CVE
CVE-2026-41277
Published
Apr 23, 2026
Updated
Apr 23, 2026
Vendor
FlowiseAI
Product
Flowise
Classifications
CWE-284, CWE-915, CWE-639, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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=< 3.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FlowiseAI · Flowiseversion=< 3.1.0

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.6GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:L/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-284Improper Access Control
CWE-915Improperly Controlled Modification of Dynamically-Determined Object Attributes
CWE-639Authorization Bypass Through User-Controlled Key
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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