budibase up to 3.35.9 Plugin URL Upload Endpoint /api/plugin fetchWithBlacklist server-side request forgery

Summaryinfo

A vulnerability was found in budibase up to 3.35.9 and classified as critical. The affected element is the function fetchWithBlacklist of the file /api/plugin of the component Plugin URL Upload Endpoint. Such manipulation leads to server-side request forgery. This vulnerability is uniquely identified as CVE-2026-45061. The attack can be launched remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in budibase up to 3.35.9. Affected by this issue is the function fetchWithBlacklist of the file /api/plugin of the component Plugin URL Upload Endpoint. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Budibase is an open-source low-code platform. Prior to 3.35.10, the Plugin URL upload endpoint (POST /api/plugin) validates the submitted URL with a single substring check: url.includes(".tar.gz"). Any URL containing .tar.gz anywhere in the string — in the path, query string, or fragment — passes this check. The URL then proceeds directly to fetchWithBlacklist() with no further validation of host, scheme, or path. Standalone, this vulnerability is blocked by Budibase's default SSRF blacklist, which covers private IP ranges. But the URL validation layer itself is broken regardless, and it directly enables SSRF in two realistic situations: (1) when chained with the BLACKLIST_IPS bypass ([001]), where the blacklist is empty; and (2) when the plugin server follows HTTP redirects from an external URL to an internal target (the default node-fetch behavior with redirect: 'follow'). This vulnerability is fixed in 3.35.10.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-45061 since 05/08/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit.

Upgrading to version 3.35.10 eliminates this vulnerability.

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Productinfo

Name

• budibase

Version

• 3.35.0
• 3.35.1
• 3.35.2
• 3.35.3
• 3.35.4
• 3.35.5
• 3.35.6
• 3.35.7
• 3.35.8
• 3.35.9

Website

• Product: https://github.com/Budibase/budibase/

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