Vulnerability · Published May 27, 2026 · Assigned by GitHub_M

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

High 7.5

In plain English

A high-severity missing authorization in budibase from Budibase. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.2%top 86.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@budibase/server	3.39.0	GHSA-qhv3-wjg8-6fx6

Affected products (as reported)

Vendor	Product	Versions
Budibase	budibase	< 3.39.0

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

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