CVE-2026-72850

CRITICAL 9.1

Budibase before 3.40.0 Arbitrary File Write via Path Traversal

CVSS Score

9.1

EPSS Score

0.0%

EPSS Percentile

0th

Budibase before 3.40.0 fails to properly sanitize S3 object keys, allowing authenticated builders to upload files with traversal sequences that are preserved during export. Attackers can craft filenames containing .. segments that escape the temporary directory during workspace export, writing arbitrary content to any path writable by the Budibase process.

CWE	CWE-22
Vendor	budibase
Product	server
Published	Aug 13, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

budibase / server

0 < 3.40.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/Budibase/budibase/security/advisories/GHSA-pxwc-66g3-5f27 vulncheck.com: https://www.vulncheck.com/advisories/budibase-before-arbitrary-file-write-via-path-traversal

Credits

🔍 hypnguyen1209