CVE-2023-29453Network attack vector

Code injection via unescaped JavaScript template literals

Published Oct 12, 2023 · Updated Sep 18, 2024

Code injection in Zabbix Agent 2 allows remote attackers to inject arbitrary JavaScript through crafted template data. The embedded Go html/template parser fails to treat backticks as JavaScript string delimiters, so action data can terminate a template literal without escaping. Exploitation requires attacker-controlled data to reach a Go template action inside a JavaScript template literal, altering the generated output with attacker-supplied script.

CVSS severity9.8
Critical
EPSS probability0.75%
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 Zabbix Agent 2 allows remote attackers to inject arbitrary JavaScript through crafted template data. The embedded Go html/template parser fails to treat backticks as JavaScript string delimiters, so action data can terminate a template literal without escaping. Exploitation requires attacker-controlled data to reach a Go template action inside a JavaScript template literal, altering the generated output with attacker-supplied script.

The record

CVE
CVE-2023-29453
Published
Oct 12, 2023
Updated
Sep 18, 2024
Vendor
Zabbix
Product
Zabbix Agent 2
Classifications
CWE-94, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2024Record 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=5.0.0 <=5.0.34
  2. Affected versionversion=6.0.0 <=6.0.17
  3. Affected versionversion=6.4.0 <=6.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zabbix · Zabbix Agent 2version=5.0.0 <=5.0.34; version=6.0.0 <=6.0.17; version=6.4.0 <=6.4.2
Zabbix · Zabbixversion=5.0.0 <=5.0.34 changes=[{"at":"5.0.35","status":"unaffected"}]; version=6.0.0 <=6.0.17 changes=[{"at":"6.0.18","status":"unaffected"}]; version=6.4.0 <=6.4.2 changes=[{"at":"6.4.3","status":"unaffected"}]

Published CVSS scores

9.8ZabbixCVSS: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')
T1059.007JavaScript/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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