---
title: "CVE-2026-89259: Hugo - File System Read & Write"
description: "Hugo > v0.43 contains a file read and write vulnerability caused by permissive Node tool execution permissions for TailwindCSS, letting attackers read and write files outside the project directory during build, exploit requires use of TailwindCSS."
url: https://panop.io/threat-heartbeat/CVE-2026-89259/
---

# CVE-2026-89259 Hugo - File System Read & Write

Hugo > v0.43 contains a file read and write vulnerability caused by permissive Node tool execution permissions for TailwindCSS, letting attackers read and write files outside the project directory during build, exploit requires use of TailwindCSS.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

EPSS

0.59% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89259)

## Details

Type

File System Read

Impact

File System Read, File System Write

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

11 September 2026

Updated

15 October 2026

Weakness

[CWE-250](https://cwe.mitre.org/data/definitions/250.html)

## Vendor fix

Update to version 0.165.0 or later, which removes TailwindCSS from the default security.exec.allow list.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89259](https://nvd.nist.gov/vuln/detail/CVE-2026-89259)
- [https://github.com/gohugoio/hugo/security/advisories/GHSA-vrm6-x8vp-mv2r](https://github.com/gohugoio/hugo/security/advisories/GHSA-vrm6-x8vp-mv2r)
- [https://www.vulncheck.com/advisories/hugo-before-0.165.0-insufficient-permission-restriction-via-tailwindcss](https://www.vulncheck.com/advisories/hugo-before-0.165.0-insufficient-permission-restriction-via-tailwindcss)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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