CVE-2026-50136: Budibase is an open-source low-code platform. Prior to 3.39.3, the application server exposes an unauthenticated endpoint that generates S3 PutObject presigned URLs using credentia
Budibase is an open-source low-code platform. Prior to 3.39.3, the application server exposes an unauthenticated endpoint that generates S3 PutObject presigned URLs using credentials stored in a workspace datasource. The route is protected only by the recaptcha middleware and does not require authentication, table permission, datasource permission, or builder access. A public caller who knows a workspace ID and S3 datasource ID can request a signed upload URL for attacker-controlled bucket and key values. This vulnerability is fixed in 3.39.3.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-50136
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-501360.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-50136 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for Budibase is an
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- highCVE-2026-54353: Budibase is an open-source low-code platform. Prior to 3.39.9, authenticated users with automa…nvd · 2026-06-26
- criticalCVE-2026-54352: Budibase is an open-source low-code platform. Prior to 3.39.9, `POST /api/pwa/process-zip` at …nvd · 2026-06-26
- highCVE-2026-54351: Budibase is an open-source low-code platform. Prior to 3.39.9, the webhook trigger endpoint in…nvd · 2026-06-26
- criticalCVE-2026-54350: Budibase is an open-source low-code platform. Prior to 3.39.12, an unauthenticated visitor of …nvd · 2026-06-26
- criticalCVE-2026-50137: Budibase is an open-source low-code platform. Prior to 3.39.0, an anonymous attacker who knows…nvd · 2026-06-26
- highCVE-2026-50132: Budibase is an open-source low-code platform. Prior to 3.39.0, `GET /api/chat-links/:instance/…nvd · 2026-06-26
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