Vulnerability · Published Jun 26, 2026 · Assigned by GitHub_M
CVE-2026-54351Budibase: Mass Assignment in Webhook Trigger Allows Cross-Workspace Automation Execution via appId Override
High 8.2
In plain English
A high-severity security flaw in budibase from Budibase. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Budibase is an open-source low-code platform. Prior to 3.39.9, the webhook trigger endpoint in Budibase is publicly accessible and passes the full HTTP request body into automation execution parameters. A mass assignment vulnerability in externalTrigger() allows an attacker to overwrite the internal appId property by including it in the webhook POST body. When the automation is processed asynchronously (the default path for webhooks without a collect step), the worker executes the attacker-defined automation in the context of the victim's workspace, granting full read/write access to the victim's database. This vulnerability is fixed in 3.39.9.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @budibase/server | 3.39.9 | GHSA-rgvg-3wpc-h44p |
Affected products (as reported)
Weakness: CWE-915 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
References
- https://github.com/Budibase/budibase/security/advisories/GHSA-rgvg-3wpc-h44p x_refsource_CONFIRM