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EUVD-2026-322464

fkie_cve-2026-45061

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.

GHSA-xh5j-727m-w6gg — Budibase vulnerable to SSRF via trivial `.tar.gz` substring bypass in Plugin URL upload (`/api/plugin`)

Affected: npm: budibase

## 1. Summary

| Field | Value | |-------|-------| | **Title** | SSRF via trivial `.tar.gz` substring bypass in Plugin URL upload | | **Product** | Budibase (Self-Hosted) | | **Version** | ≤ 3.34.11 (latest stable as of 2026-03-30) | | **Component** | `packages/server/src/api/controllers/plugin/url.ts` | | **Vulnerability Type** | CWE-918: Server-Side Request Forgery (SSRF), CWE-184: Incomplete List of Disallowed Inputs | | **Severity** | High (chained) / Medium (standalone) | | **CVSS 3.1 Score (chained)** | 7.7 — `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N` | | **CVSS 3.1 Score (standalone)** | 5.4 — `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N` | | **Attack Vector** | Network | | **Privileges Required** | Low (Global Builder role) | | **User Interaction** | None | | **Affected Deployments** | All Budibase instances with plugin loading enabled (default) |

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## 2. Description

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 c…

WID-SEC-W-2026-1402 — Budibase: Schwachstelle ermöglicht Offenlegung von Informationen

Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Budibase ausnutzen, um Informationen offenzulegen.