CVE-2026-73307 Budibase: SSRF via bare fetch() in uploadUrl during AI table generation
A builder can exploit an SSRF vulnerability in AI table generation to access internal services or cloud metadata endpoints via unvalidated attachment URLs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73307?
CVE-2026-73307 is a medium-severity server-side request forgery vulnerability in budibase, published on 12 Aug 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 3.39.4, 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-73307?
2 open source packages ship an affected version, including @budibase/server.
| Package | Affected | Fixed in |
|---|---|---|
@budibase/server npm | All versions to 3.38.1 | None |
@budibase/server npm | All versions to 3.38.1 | None |
How do I fix CVE-2026-73307?
No fix has been published for CVE-2026-73307 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-73307 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-73307 exists.
Sources
Also known as GHSA-hfhx-w8p8-4hc7.