Templates do not properly consider backticks (`) as Javascript string delimiters, and do not escape them as expected. Backticks are used, since ES6, for JS template literals. If a template contains a Go template action within a Javascript template literal, the contents of the action can be used to terminate the literal, injecting arbitrary Javascript code into the Go template. As ES6 template literals are rather complex, and themselves can do string interpolation, the decision was made to simply disallow Go template actions from being used inside of them (e.g., "var a = {{.}}"), since there is no obviously safe way to allow this behavior. This takes the same approach as github.com/google/safehtml. With fix, Template. Parse returns an Error when it encounters templates like this, with an ErrorCode of value 12. This ErrorCode is currently unexported but will be exported in the release of Go 1.21. Users who rely on the previous behavior can re-enable it using the GODEBUG flag jstmpllitinterp=1, with the caveat that backticks will now be escaped. This should be used with caution.
Conclusion & alert: CVE-2023-29453 is rated Moderate Risk (63/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.56%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-01-23 | 0.43% | 0.56% | +0.13% |
| 2 | 2025-11-21 | 0.85% | 0.43% | -0.43% |
| 3 | 2025-11-18 | — | 0.85% | — |
Full EPSS history (13 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.8 | 3.1 | CRITICAL |
|
3.9 | 5.9 | [email protected] |
| 9.8 | 3.1 | CRITICAL |
|
3.9 | 5.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
unimportant | CVE-2023-29453 unimportant priority: Debian including 1 source packages (zabbix), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. | https://security-tracker.debian.org/tracker/CVE-2023-29453 |
ubuntu
|
medium | CVE-2023-29453 medium priority: Ubuntu including 1 source packages (zabbix), 12 status rows across 12 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 7, ignored 2, DNE 1, needed 1, released 1. | https://ubuntu.com/security/CVE-2023-29453 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| zabbix | zabbix-agent2 | >= 5.0.0, < 5.0.35 | cpe:2.3:a:zabbix:zabbix-agent2:*:*:*:*:*:*:*:* |
| zabbix | zabbix-agent2 | >= 6.0.0, < 6.0.18 | cpe:2.3:a:zabbix:zabbix-agent2:*:*:*:*:*:*:*:* |
| zabbix | zabbix-agent2 | >= 6.4.0, < 6.4.3 | cpe:2.3:a:zabbix:zabbix-agent2:*:*:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| https://support.zabbix.com/browse/ZBX-23388 | Vendor Advisory |