---
title: "CVE-2026-54352: Budibase has arbitrary file read by workspace-builder via PWA-zip symlink upload"
url: https://erroneo.us/security/cve/CVE-2026-54352/
description: "CVE-2026-54352 (@budibase/server (npm)): Budibase is an open-source low-code platform. Prior to 3.39.9, POST /api/pwa/process-zip at…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-26
date_modified: 2026-08-12
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-54352"
kev: false
cvss: 9.6
epss: 0.00494
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-54352: Budibase has arbitrary file read by workspace-builder via PWA-zip symlink upload

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.5% , percentile 41: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 41% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes @budibase/server (npm) < 3.39.9, fixed in 3.39.9 . Check your lockfile, including transitive dependencies.

## What it is

Budibase is an open-source low-code platform. Prior to 3.39.9, POST /api/pwa/process-zip at packages/server/src/api/routes/static.ts:24 accepts a builder-uploaded .zip, extracts it with extract-zip@2.0.1 into a temp directory, then for each entry listed in icons.json validates the icon path, opens it, and streams the bytes into MinIO. The resulting object is served back via GET /api/assets/{appId}/pwa/{uuid}.png. extract-zip@2.0.1 preserves absolute symlink targets when restoring symlink entries. The icon-source validator at packages/server/src/api/controllers/static/index.ts:259-268 resolves the icon source string against baseDir (path.resolve), checks resolvedSrc.startsWith(baseDir + path.sep) against that string, and calls fs.existsSync(resolvedSrc) which follows symbolic links to confirm the target exists. None of the three calls reject symbolic-link entries. packages/backend-core/src/objectStore/objectStore.ts:302 then calls (await fsp.open(path)).createReadStream() on the resolved path. fsp.open follows the symlink, the target file's bytes stream into MinIO, and the response of the asset-fetch endpoint returns those bytes verbatim. Result: a workspace-level builder reads any file the server process can open. This vulnerability is fixed in 3.39.9.

## Affected packages

- npm `@budibase/server` < 3.39.9 → fixed: 3.39.9

## Affected products (CVE record)

- Budibase budibase: < 3.39.9

## Severity

- GitHub_M CVSS 3.1: 9.6 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.6 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N`

## Exploitation

- 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): 0.49% probability of exploitation activity in the next 30 days; percentile 41.

## Sources

- [GitHub Advisory GHSA-w7mq-r738-x278](https://github.com/advisories/GHSA-w7mq-r738-x278)
- [CVE.org record CVE-2026-54352](https://www.cve.org/CVERecord?id=CVE-2026-54352)
- [NVD entry CVE-2026-54352](https://nvd.nist.gov/vuln/detail/CVE-2026-54352)
- [github.com](https://github.com/Budibase/budibase/security/advisories/GHSA-w7mq-r738-x278)

---
Source page: https://erroneo.us/security/cve/CVE-2026-54352/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt