CVE-2026-27142Network attack vector

Cross-site scripting via unescaped meta refresh URLs

Published Mar 6, 2026 · Updated Mar 6, 2026

Cross-site scripting in Go html/template before 1.25.8 and from 1.26.0-0 before 1.26.1 allows remote attackers to execute script. The tTag and escaper.escapeAction path fails to apply URL escaping to an untrusted template action placed after url= in a meta content attribute. Exploitation requires a trusted template containing an http-equiv=refresh meta tag, attacker-controlled execution data, and a user who loads the rendered page.

CVSS severity6.1
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

Cross-site scripting in Go html/template before 1.25.8 and from 1.26.0-0 before 1.26.1 allows remote attackers to execute script. The tTag and escaper.escapeAction path fails to apply URL escaping to an untrusted template action placed after url= in a meta content attribute. Exploitation requires a trusted template containing an http-equiv=refresh meta tag, attacker-controlled execution data, and a user who loads the rendered page.

The record

CVE
CVE-2026-27142
Published
Mar 6, 2026
Updated
Mar 6, 2026
Vendor
Go
Product
html/template
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 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 <1.25.8
  2. Affected versionversion=1.26.0-0 <1.26.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go · html/templateversion=0 <1.25.8; version=1.26.0-0 <1.26.1

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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