Vulnerability · Published Aug 12, 2026 · Assigned by GitHub_M

CVE-2026-73307Budibase: SSRF via bare fetch() in uploadUrl during AI table generation

Medium 4.9

In plain English

A medium-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 0.4% (higher than 37% of all known vulnerabilities).

Severity (CVSS 4.0)4.9Medium

Exploit odds (30 days)0.4%top 62.8% 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 3.39.4, uploadUrl in packages/server/src/utilities/fileUtils.ts used a bare server-side fetch for string attachment values passed by processAttachments in packages/server/src/sdk/workspace/ai/helpers/rows.ts. A builder with the AI table-generation feature could cause an attachment value to reference an internal service or cloud metadata endpoint, and the response would be stored as an attachment without fetchWithBlacklist validation. This issue is fixed in version 3.39.4.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@budibase/server	no fix listed	GHSA-hfhx-w8p8-4hc7

Affected products (as reported)

Vendor	Product	Versions
Budibase	budibase	< 3.39.4

Weakness: CWE-918 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N

References

https://github.com/Budibase/budibase/security/advisories/GHSA-hfhx-w8p8-4hc7 x_refsource_CONFIRM
https://github.com/Budibase/budibase/pull/18866 x_refsource_MISC
https://github.com/Budibase/budibase/commit/fc8161e739bdc5513c4314282251e327e7fe339f x_refsource_MISC
https://github.com/Budibase/budibase/releases/tag/3.39.4 x_refsource_MISC