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VulnerabilityPublished

CVE-2026-35219: Budibase · SSRF in Automation Steps - Webhook, Zapier, N8N, Slack, Discord Bypass IP Blacklist

Affects @budibase/serverSource GCVE Database

0

Not known to be exploited · CVSS 7.1 High : upgrade to 3.41.3 soon.

Data as of 27 Oct 2026, 05:11 UTC

CVSS 4.0 base score
7.1High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 40% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.41.3
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 14 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade @budibase/server to 3.41.3.

Affected software

ProductAffectedFixed in
npm@budibase/serverAffected
  • <3.41.3
Fixed in
  • 3.41.3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

## Summary Budibase 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. ## Vulnerable Code ### Automation Steps (No Blacklist) All automation steps use `fetch()` directly without any IP validation: **`packages/server/src/automations/steps/outgoingWebhook.ts` line 69:** ```typescript const response = await fetch(url, request) // No blacklist check ``` **`packages/server/src/automations/steps/zapier.ts` line 34:** ```typescript response = await fetch(url, {method: "post", ...}) // No blacklist check ``` **`packages/server/src/automations/steps/n8n.ts` line 53:** ```typescript response = await fetch(url, request) // No blacklist check ``` **`packages/server/src/automations/steps/slack.ts` line 20:** ```typescript response = await fetch(url, {method: "post", ...}) // No blacklist check ``` **`packages/server/src/automations/steps/discord.ts` line 29:** ```typescript response = await fetch(url, {method: "post", ...}) // No blacklist check ``` ### REST API Integration (Empty Default Blacklist) **`packages/server/src/integrations/rest.ts` line 684:** ```typescript if (await blacklist.isBlacklisted(url)) { throw new Error("Cannot connect to URL.") } ``` But `BLACKLIST_IPS` env var defaults to undefined, so the blacklist is empty: **`packages/backend-core/src/blacklist/blacklist.ts` lines 39-45:** ```typescript if (blackListArray?.length === 0) { return false // Always passes when no IPs configured } ``` ## Impact - **Automation steps**: ANY user can create automations with webhook/Zapier/n8n/Slack/Discord steps pointing to internal IPs. These completely bypass the blacklist module - **REST API**: Even when BLACKLIST_IPS is configured, it only blocks listed IPs. Default deployments have no protection. - **Cloud metadata**: `http://169.254.169.254/latest/meta-data/` accessible via any automation step - **Internal services**: Access databases, admin panels, Kubernetes API on private IPs ## Remediation 1. Apply blacklist checks to ALL outbound HTTP requests, including automation steps 2. 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) 3. Use a centralized HTTP client wrapper instead of direct `fetch()` calls 4. SSRF protection should be on by default, not opt-in via environment variable

References

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