CVE-2026-89259Hinoki check available

File access outside build root via TailwindCSS

Published Sep 11, 2026 · Updated Sep 11, 2026

Improper permission restriction in Hugo after 0.43 and before 0.165.0 allows attackers to read or write files outside the build root via TailwindCSS. Hugo's default security.exec.allow list launches TailwindCSS while Node receives addon, child-process, and worker permissions that defeat the intended file-system boundary. Exposure requires a build of an untrusted site that uses TailwindCSS; successful access is limited by the build account's file permissions.

CVSS severityUnavailable
Unscored
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper permission restriction in Hugo after 0.43 and before 0.165.0 allows attackers to read or write files outside the build root via TailwindCSS. Hugo's default security.exec.allow list launches TailwindCSS while Node receives addon, child-process, and worker permissions that defeat the intended file-system boundary. Exposure requires a build of an untrusted site that uses TailwindCSS; successful access is limited by the build account's file permissions.

The record

CVE
CVE-2026-89259
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
Hugo Authors
Product
Hugo
Classifications
T1204.002
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.165.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Hugo Authors · Hugoversion=0 <0.165.0

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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