Path Traversal in Budibase Server
CVE-2026-72850
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Budibase Server — versions 0, 3.40.0
Weakness classification (CWE)
References
- github.com/Budibase/budibase/security/advisories/GHSA-pxwc-66g3-5f27 (vendor-advisory)
- www.vulncheck.com/advisories/budibase-before-arbitrary-file-write-via-path-trav… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-72850?
- CVE-2026-72850 is a critical-severity vulnerability in Budibase Server, classified under Path Traversal. CVSS score: 9.1/10. Published 2026-08-13.
- How severe is CVE-2026-72850?
- Critical severity. CVSS v3 base score is 9.1 out of 10.