CVE-2026-54351Public exploitNetwork attack vector

Cross-workspace data access via appId mass assignment

Published Jun 26, 2026 · Updated Jun 26, 2026

Mass assignment in Budibase before 3.39.9 allows remote authenticated users to read and write another workspace's data via a webhook. The public webhook controller places the raw POST body in fields, and externalTrigger() spreads those fields over server-derived parameters so appId replaces the trusted workspace context. Exploitation requires builder access to an attacker-controlled workspace, a known victim workspace ID, and the default asynchronous path used by webhooks without a collect step.

CVSS severity8.2
High
EPSS probability0.46%
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 Budibase before 3.39.9 allows remote authenticated users to read and write another workspace's data via a webhook. The public webhook controller places the raw POST body in fields, and externalTrigger() spreads those fields over server-derived parameters so appId replaces the trusted workspace context. Exploitation requires builder access to an attacker-controlled workspace, a known victim workspace ID, and the default asynchronous path used by webhooks without a collect step.

The record

CVE
CVE-2026-54351
Published
Jun 26, 2026
Updated
Jun 26, 2026
Vendor
Budibase
Product
Budibase
Classifications
CWE-915, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 26, 2026Record 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=< 3.39.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Budibase · Budibaseversion=< 3.39.9

Published CVSS scores

8.2GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
9.6NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-915Improperly Controlled Modification of Dynamically-Determined Object Attributes
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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