Security Digest · Vulnerability record
CVE-2026-35216: Budibase: Unauthenticated Remote Code Execution via Webhook Trigger and Bash Automation Step
Budibase is an open-source low-code platform.
CVSS 9.1 Critical EPSS 1.2% · p67
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- Not in CISA KEV, but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 1.2%, percentile 67: FIRST’s model estimates a 1.2% chance of exploitation activity in the next 30 days, higher than 67% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes
@budibase/server(npm) < 3.33.4, fixed in 3.33.4. Check your lockfile, including transitive dependencies.
What it is
Budibase is an open-source low-code platform. Prior to version 3.33.4, an unauthenticated attacker can achieve Remote Code Execution (RCE) on the Budibase server by triggering an automation that contains a Bash step via the public webhook endpoint. No authentication is required to trigger the exploit. The process executes as root inside the container. This issue has been patched in version 3.33.4.
From the GitHub advisory
Summary An unauthenticated attacker can achieve Remote Code Execution (RCE) on the Budibase server by triggering an automation that contains a Bash step via the public webhook endpoint. No authentication is required to trigger the exploit. The process executes as root inside the container.
Details
Vulnerable endpoint — packages/server/src/api/routes/webhook.ts line 13:
The webhook trigger endpoint is registered on publicRoutes with no authentication middleware. Any unauthenticated HTTP client can POST to this endpoint.
Vulnerable sink — packages/server/src/automations/steps/bash.ts lines 21–26:
Weakness type: CWE-78.
Product: @budibase/server (npm) · Assigned by: GitHub_M · Published: 2026-04-03
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| npm | @budibase/server | < 3.33.4 | 3.33.4 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Budibase | budibase | < 3.33.4 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_M | 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
| GitHub | 3.1 | 9.0 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: high (needs special conditions)
- Privileges required: none (no login)
- User interaction: none
- Scope: changed (can affect other components)
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc, automatable no, technical impact total.
- FIRST EPSS (model of 2026-10-21): 1.17% probability of exploitation activity in the next 30 days; percentile 67.
Timeline
- — CVE record last updated
- — CVE record published by GitHub_M
- — GitHub-reviewed advisory GHSA-fcm4-4pj2-m5hf published (critical)
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-fcm4-4pj2-m5hf github.com
- CVE.org record CVE-2026-35216 cve.org
- NVD entry CVE-2026-35216 nvd.nist.gov
Other references from the CVE record and advisory
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com