Vulnerability · Published May 27, 2026 · Assigned by GitHub_M

CVE-2026-48153Budibase: SSRF via OAuth2 token endpoint URL reaches internal hosts and cloud metadata

High 8.5

In plain English

A high-severity server-side request forgery 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 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.5High

Exploit odds (30 days)0.2%top 93.0% 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, fetchToken in the OAuth2 SDK makes a POST to a builder-supplied URL with plain node-fetch, skipping the blacklist.isBlacklisted check that every other outbound fetch path in the codebase uses. The Joi schema for the OAuth2 URL has no scheme or host restriction. This vulnerability is fixed in 3.39.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@budibase/server	3.39.0	GHSA-4q6h-8p4v-67vq

Affected products (as reported)

Vendor	Product	Versions
Budibase	budibase	< 3.39.0

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

References

https://github.com/Budibase/budibase/security/advisories/GHSA-4q6h-8p4v-67vq x_refsource_CONFIRM