CVE-2026-32289Network attack vector

XSS via mistracked JavaScript template-literal context

Published Apr 8, 2026 · Updated Apr 8, 2026

Cross-site scripting in Go html/template before 1.25.9 and 1.26.0-0 through 1.26.1 allows attackers to inject script via crafted template data. The contextual escaper omits jsBraceDepth from branch comparison and context mangling, then tracks braces without updating JavaScript expression state, causing data actions to receive the wrong escaping mode. Only templates with actions inside JavaScript template literals are exposed, and script execution occurs when a user loads the rendered HTML.

CVSS severity6.1
Medium
EPSS probability0.29%
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 1.25.9 and 1.26.0-0 through 1.26.1 allows attackers to inject script via crafted template data. The contextual escaper omits jsBraceDepth from branch comparison and context mangling, then tracks braces without updating JavaScript expression state, causing data actions to receive the wrong escaping mode. Only templates with actions inside JavaScript template literals are exposed, and script execution occurs when a user loads the rendered HTML.

The record

CVE
CVE-2026-32289
Published
Apr 8, 2026
Updated
Apr 8, 2026
Vendor
Go
Product
html/template
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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 <1.25.9
  2. Affected versionversion=1.26.0-0 <1.26.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go · html/templateversion=0 <1.25.9; version=1.26.0-0 <1.26.2

Published CVSS scores

6.1NIST NVDCVSS: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')
T1203Exploitation for Client Execution

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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