CVE-2026-54356
Budibase authenticated arbitrary S3 signed upload URL issuance via /api/attachments/:datasourceId/url
- Published
- Aug 17, 2026
- Updated
- Aug 18, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 21, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:LLow · next 30 days
- Percentile
- 15.9%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
Budibase is an open-source low-code platform. Prior to 3.41.3, POST /api/attachments/:datasourceId/url in packages/server/src/api/routes/static.ts and packages/server/src/api/controllers/static/index.ts allows an authenticated published-app user with the BASIC role to supply attacker-controlled bucket and key values and obtain signedUrl and publicUrl values backed by stored S3 datasource credentials. This issue is fixed in version 3.41.3.
Sources
1Proof-of-concept exploit and advisory for CVE-2026-54356, a Budibase missing-authorization flaw that lets low-privilege users mint S3 pre-signed upload URLs with stored AWS credentials.
Responsible use
Use vulnerability information only on systems you own or are authorized to test. Kitploit links to public research metadata and does not store exploit code or malicious payloads.