CVE-2026-89258Hinoki check available

File disclosure via parent-directory symlink following

Published Sep 11, 2026 · Updated Sep 11, 2026

File disclosure in Hugo Authors Hugo allows attackers to read files outside project boundaries via direct lookups through symlinks. The resources.Get and os.ReadFile functions follow parent-directory symlinks instead of rejecting them, exposing file contents in the built site. Exploitation requires placing a symlink in a mounted directory or convincing a site author to do so; GitHub-fetched Go module themes strip symlinks, and multi-directory walks are unaffected.

CVSS severity6.3
Medium
EPSS probability0.47%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

File disclosure in Hugo Authors Hugo allows attackers to read files outside project boundaries via direct lookups through symlinks. The resources.Get and os.ReadFile functions follow parent-directory symlinks instead of rejecting them, exposing file contents in the built site. Exploitation requires placing a symlink in a mounted directory or convincing a site author to do so; GitHub-fetched Go module themes strip symlinks, and multi-directory walks are unaffected.

The record

CVE
CVE-2026-89258
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
Hugo Authors
Product
Hugo
Classifications
CWE-59, T1005
Attack vector
local
Privileges
unauthenticated

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 privilegesunauthenticated

What is affected?

Hugo Authors · Hugoversion=0 <0.165.0

Published CVSS scores

6.3VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
6.3Red HatCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.3UbuntuCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
6.3UbuntuCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
T1005Data from Local System

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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