CVE-2026-48152 Budibase: Basic app users can exfiltrate stored REST datasource auth by rewriting datasource base URL
Basic users can exfiltrate stored REST datasource authentication secrets by rewriting the datasource base URL due to insufficient permission checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-48152?
CVE-2026-48152 is a high-severity missing authorization vulnerability in budibase, published on 27 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Budibase is an open-source low-code platform. Prior to 3.39.0, the single-datasource GET and PUT routes are guarded by generic TABLE READ, not by Builder/Admin permission or datasource-specific ownership/resource checks. The built-in Basic app user role maps to the WRITE permission set, which includes table read/write and query write. A Basic user can therefore read an existing REST datasource, receive redacted authConfigs values, submit an update that changes only config.url while keeping the redacted placeholders, and trigger an existing saved relative-path REST query. During update, mergeConfigs() restores the old stored secret when it sees the redaction placeholder. During query execution, Budibase prefixes the attacker-controlled datasource config.url to the relative query path and applies the resolved stored auth headers. The result is server-side disclosure of the builder-configured REST Authorization secret to an attacker-controlled listener. This vulnerability is fixed in 3.39.0.
Weakness: CWE-863
Which versions are affected by CVE-2026-48152?
2 open source packages ship an affected version, including @budibase/server.
| Package | Affected | Fixed in |
|---|---|---|
@budibase/server npm | All versions | 3.39.0 |
@budibase/server npm | All versions | 3.39.0 |
How do I fix CVE-2026-48152?
Upgrade @budibase/server to 3.39.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-48152 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48152 exists.
Sources
Also known as GHSA-3gp5-q4jw-3v94.