CVE-2026-50136 is a high-severity security vulnerability in @budibase/server (npm), affecting versions < 3.39.2. It is fixed in 3.39.2.
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. Details The static route registers the signed upload URL endpoint with only recaptcha before the controller: packages/server/src/api/routes/static.ts:44-48 The controller loads the datasource by datasourceId with enriched secret values: packages/server/src/api/controllers/static/index.ts:590-598 The request body controls bucket and key, and the server signs a PUT URL using the stored datasource credentials: packages/server/src/api/controllers/static/index.ts:609-629 The endpoint returns the signed URL and public URL to the caller: packages/server/src/api/controllers/static/index.ts:630-639 Because no authorization middleware is applied, the API trusts public input to choose where the stored S3 credentials will write. PoC Non-destructive validation approach: Create or identify a workspace with an S3 datasource. Obtain the production workspace ID and S3 datasource ID. Send an unauthenticated request with the workspace ID header and attacker-controlled bucket/key: Observe that the response contains a signed PUT URL. Upload harmless content to the returned signedUrl and confirm the object is created using the datasource's stored S3 credentials. Impact This allows unauthenticated arbitrary object writes wherever the stored S3 datasource credentials have PutObject access. Depending on the datasource permissions, this can corrupt application data, overwrite public assets, place attacker-controlled objects in trusted buckets, consume storage, or abuse an organization's cloud credentials.
CVE-2026-50136 has a CVSS score of 7.4 (High). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.
A fixed version is available (3.39.2). Upgrading removes the vulnerable code path.
npm
@budibase/server (< 3.39.2)@budibase/server → 3.39.2 (npm)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
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CVE-2026-50136 is a high-severity security vulnerability in @budibase/server (npm), affecting versions < 3.39.2. It is fixed in 3.39.2.
CVE-2026-50136 has a CVSS score of 7.4 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
@budibase/server (npm) versions < 3.39.2 is affected.
Yes. CVE-2026-50136 is fixed in 3.39.2. Upgrade to this version or later.
Whether CVE-2026-50136 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
Upgrade @budibase/server to 3.39.2 or later.