CVE-2026-50133Network attack vector

Stored XSS via verbatim HTML body rendering

Published Jul 6, 2026 · Updated Jul 6, 2026

Stored cross-site scripting in Hugo before 0.162.0 allows remote attackers to execute script in visitors' browsers through untrusted HTML content. The content pipeline classifies HTML files and content-adapter output as text/html, then emits each body verbatim into the generated page without rejecting or neutralizing script-capable markup. Exploitation requires a site to ingest attacker-controlled HTML and a visitor to open the generated page; trusted-only content and non-HTML markup are unaffected.

CVSS severity5.1
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Hugo before 0.162.0 allows remote attackers to execute script in visitors' browsers through untrusted HTML content. The content pipeline classifies HTML files and content-adapter output as text/html, then emits each body verbatim into the generated page without rejecting or neutralizing script-capable markup. Exploitation requires a site to ingest attacker-controlled HTML and a visitor to open the generated page; trusted-only content and non-HTML markup are unaffected.

The record

CVE
CVE-2026-50133
Published
Jul 6, 2026
Updated
Jul 6, 2026
Vendor
Hugo Authors
Product
Hugo
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 6, 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=< 0.162.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hugo Authors · Hugoversion=< 0.162.0

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.1GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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