Vulnerability in Budibase
CVE-2026-54351
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.
Vulnerability class: Mass Assignment
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (37.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Budibase — versions < 3.39.9
Weakness classification (CWE)
References
- github.com/Budibase/budibase/security/advisories/GHSA-rgvg-3wpc-h44p (Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-54351?
- CVE-2026-54351 is a high-severity vulnerability in Budibase, classified under Improperly Controlled Modification of Dynamically-Determined Object Attributes. CVSS score: 8.2/10. Published 2026-06-26.
- How severe is CVE-2026-54351?
- High severity. CVSS v3 base score is 8.2 out of 10.