CVE-2026-48151: Budibase: Webhook schema endpoint authorization bypass allows unauthenticated mutation of webhook and automation schema

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-27 · updated 2026-06-17
Weakness: CWE-862

Description

Budibase is an open-source low-code platform. Prior to 3.39.0, the webhook schema-building endpoint is registered under builderRoutes, but the generic authorization middleware skips authorization for all paths matching /api/webhooks/schema. As a result, an unauthenticated caller can update the body schema for a known webhook and mutate the corresponding automation trigger output schema. This vulnerability is fixed in 3.39.0.

Affected products

budibase: before 3.39.0

References

https://github.com/Budibase/budibase/security/advisories/GHSA-qhv3-wjg8-6fx6
https://github.com/Budibase/budibase/security/advisories/GHSA-qhv3-wjg8-6fx6

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