{"id":"GHSA-5fpj-28rv-84r7","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","aliases":["CVE-2026-35219"],"modified":"2026-08-14T19:41:00.947989Z","published":"2026-08-14T19:18:47Z","database_specific":{"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-08-14T19:18:47Z","nvd_published_at":null,"cwe_ids":["CWE-918"]},"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"}],"affected":[{"package":{"name":"@budibase/server","ecosystem":"npm","purl":"pkg:npm/%40budibase/server"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.41.3"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-5fpj-28rv-84r7/GHSA-5fpj-28rv-84r7.json"}}],"schema_version":"1.9.0","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"}]}