---
id: CVE-2026-100682
title: >-
  Budibase Server before 3.45.0 contains an arbitrary file write vulnerability
  in the PWA icon upload endpoint that extracts user-supplied ZIP archives
  without proper symlink validation
summary: >-
  Budibase Server before 3.45.0 contains an arbitrary file write vulnerability
  in the PWA icon upload endpoint that extracts user-supplied ZIP archives
  without proper symlink validation. Attackers with BUILDER role can craft a
  malicious ZI…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-22
vendor: budibase
product: server
affected:
  - server < 3.45.0
published: '2026-09-26'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T16:16:58.553'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100682'
references:
  - url: >-
      https://github.com/Budibase/budibase/security/advisories/GHSA-37r6-5jxh-vm83
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/budibase-server-before-3.45.0-arbitrary-file-write-via-zip-symlink
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/Budibase/budibase/security/advisories/GHSA-37r6-5jxh-vm83
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-30T15:01:12.801469Z'
epss: 0.00724
epssPercentile: 0.53855
ingestedAt: '2026-09-26T13:33:20.909Z'
---

## Overview

Budibase Server before 3.45.0 contains an arbitrary file write vulnerability in the PWA icon upload endpoint that extracts user-supplied ZIP archives without proper symlink validation. Attackers with BUILDER role can craft a malicious ZIP with leaf symlink entries followed by duplicate file entries to write arbitrary files as root, enabling remote code execution.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.