CVE-2023-24538Network attack vector

JavaScript injection via unescaped template-literal backticks

Published Apr 6, 2023 · Updated Feb 13, 2025

Code injection in Go standard library html/template before 1.19.8 and 1.20.0 through 1.20.2 allows attackers to inject JavaScript. The tJS and tJSDelimited escaping logic fails to recognize backticks as JavaScript string delimiters, so action values can terminate a template literal and introduce executable code. Exploitation requires an application to place attacker-controlled action data inside an ECMAScript 6 template literal and deliver the rendered output to a JavaScript interpreter.

CVSS severity9.8
Critical
EPSS probability2.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Go standard library html/template before 1.19.8 and 1.20.0 through 1.20.2 allows attackers to inject JavaScript. The tJS and tJSDelimited escaping logic fails to recognize backticks as JavaScript string delimiters, so action values can terminate a template literal and introduce executable code. Exploitation requires an application to place attacker-controlled action data inside an ECMAScript 6 template literal and deliver the rendered output to a JavaScript interpreter.

The record

CVE
CVE-2023-24538
Published
Apr 6, 2023
Updated
Feb 13, 2025
Vendor
Go standard library
Product
html/template
Classifications
CWE-94, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record 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 <1.19.8
  2. Affected versionversion=1.20.0-0 <1.20.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · html/templateversion=0 <1.19.8; version=1.20.0-0 <1.20.3

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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-94Improper Control of Generation of Code ('Code Injection')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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