CVE-2026-35219: Budibase SSRF Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5fpj-28rv-84r7",
  "modified" : "2026-08-14T19:18:47Z",
  "published" : "2026-08-14T19:18:47Z",
  "aliases" : [ "CVE-2026-35219" ],
  "summary" : "Budibase: SSRF in Automation Steps - Webhook, Zapier, N8N, Slack, Discord Bypass IP Blacklist",
  "details" : "## Summary\n\nBudibase automation steps (outgoing webhook, Zapier, n8n, Slack, Discord, Make.com) make server-side HTTP requests to user-provided URLs using `node-fetch` directly, completely bypassing the IP blacklist protection that exists in the REST API integration. Additionally, the REST API blacklist itself defaults to empty when `BLACKLIST_IPS` is not configured.\n\n## Vulnerable Code\n\n### Automation Steps (No Blacklist)\n\nAll automation steps use `fetch()` directly without any IP validation:\n\n**`packages/server/src/automations/steps/outgoingWebhook.ts` line 69:**\n```typescript\nconst response = await fetch(url, request)  // No blacklist check\n```\n\n**`packages/server/src/automations/steps/zapier.ts` line 34:**\n```typescript\nresponse = await fetch(url, {method: \"post\", ...})  // No blacklist check\n```\n\n**`packages/server/src/automations/steps/n8n.ts` line 53:**\n```typescript\nresponse = await fetch(url, request)  // No blacklist check\n```\n\n**`packages/server/src/automations/steps/slack.ts` line 20:**\n```typescript\nresponse = await fetch(url, {method: \"post\", ...})  // No blacklist check\n```\n\n**`packages/server/src/automations/steps/discord.ts` line 29:**\n```typescript\nresponse = await fetch(url, {method: \"post\", ...})  // No blacklist check\n```\n\n### REST API Integration (Empty Default Blacklist)\n\n**`packages/server/src/integrations/rest.ts` line 684:**\n```typescript\nif (await blacklist.isBlacklisted(url)) {\n  throw new Error(\"Cannot connect to URL.\")\n}\n```\n\nBut `BLACKLIST_IPS` env var defaults to undefined, so the blacklist is empty:\n\n**`packages/backend-core/src/blacklist/blacklist.ts` lines 39-45:**\n```typescript\nif (blackListArray?.length === 0) {\n  return false  // Always passes when no IPs configured\n}\n```\n\n## Impact\n\n- **Automation steps**: ANY user can create automations with webhook/Zapier/n8n/Slack/Discord steps pointing to internal IPs. These completely bypass the blacklist module\n- **REST API**: Even when BLACKLIST_IPS is configured, it only blocks listed IPs. Default deployments have no protection.\n- **Cloud metadata**: `http://169.254.169.254/latest/meta-data/` accessible via any automation step\n- **Internal services**: Access databases, admin panels, Kubernetes API on private IPs\n\n## Remediation\n\n1. Apply blacklist checks to ALL outbound HTTP requests, including automation steps\n2. Add hardcoded default private IP ranges (127.0.0.0/8, 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, 169.254.0.0/16)\n3. Use a centralized HTTP client wrapper instead of direct `fetch()` calls\n4. SSRF protection should be on by default, not opt-in via environment variable",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@budibase/server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.41.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/Budibase/budibase/security/advisories/GHSA-5fpj-28rv-84r7"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/Budibase/budibase"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Budibase/budibase/releases/tag/3.41.3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-14T19:18:47Z",
    "nvd_published_at" : null
  }
}