Disable JavaScript tags in embedded HTML

reference brazil Updated Sep 10, 2026 1 min read sc-allow-javascript-tags-in-embedded-html.md

Use the glide.ui.security.codetag.allow_script property to disable support for embedding HTML JavaScript code created using of the [code] tag.

If glide.ui.security.codetag.allow_script is not set to the recommended value of false, then this property allows rendered HTML in journal fields and forms which opens room for XSS attacks. Malicious HTML needs to be put between code tags for example [code][/code].

Ensure that the glide.ui.security.codetag.allow_script property exists in the System Properties [sys_properties] table and is set to false.

Warning: This is a safe harbor property, meaning the value can't be altered once it's changed. It is non-revertible.

More information

Attribute	Description
Configuration name	glide.ui.security.codetag.allow_script
Configuration type	System Properties (/sys_properties_list.do)
Data type	Boolean
Recommended value	false
Default value	false
Fallback value	true
Category	Validation, sanitization, and encoding
Security risk	Severity score: High CVSS rating:8.8 Security risk details: Uncontrolled JavaScript risks Cross-Site Scripting (XSS) attacks, enabling malicious actors to inject and execute harmful scripts in the user's browser. Such attacks can lead to session hijacking, credential theft, and compromise of sensitive data.
Functional impact	None
Dependencies and prerequisites	None

**Parent Topic:**[Validation, sanitization, and encoding](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/brazil/markdown/platform-security/instance-security-hardening-settings/validation-sanitization-encoding.md)

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---
title: Disable JavaScript tags in embedded HTML
description: Use the glide.ui.security.codetag.allow\_script property to disable support for embedding HTML JavaScript code created using of the \[code\] tag.
locale: en-US
canonical_url: https://www.servicenow.com/docs/r/platform-security/instance-security-hardening-settings/sc-allow-javascript-tags-in-embedded-html.html
release: brazil
product: Instance Security Hardening Settings
classification: instance-security-hardening-settings
topic_type: reference
last_updated: "2026-09-10"
reading_time_minutes: 1
breadcrumb: [Validation, sanitization, and encoding, Hardening settings, Platform Security]
---

# Disable JavaScript tags in embedded HTML

Use the **glide.ui.security.codetag.allow\_script** property to disable support for embedding HTML JavaScript code created using of the \[code\] tag.

If **glide.ui.security.codetag.allow\_script** is not set to the recommended value of **false**, then this property allows rendered HTML in journal fields and forms which opens room for XSS attacks. Malicious HTML needs to be put between code tags for example \[code\]\[/code\].

Ensure that the **glide.ui.security.codetag.allow\_script** property exists in the System Properties \[sys\_properties\] table and is set to **false**.

**Warning:** This is a safe harbor property, meaning the value can't be altered once it's changed. It is non-revertible.

## More information

<table id="table_ajc_b43_3kb"><thead><tr><th>

Attribute

</th><th>

Description

</th></tr></thead><tbody><tr><td>

Configuration name

</td><td>

**glide.ui.security.codetag.allow\_script**

</td></tr><tr><td>

Configuration type

</td><td>

System Properties \(/sys\_properties\_list.do\)

</td></tr><tr><td>

Data type

</td><td>

Boolean

</td></tr><tr><td>

Recommended value

</td><td>

false

</td></tr><tr><td>

Default value

</td><td>

false

</td></tr><tr><td>

Fallback value

</td><td>

true

</td></tr><tr><td>

Category

</td><td>

[Validation, sanitization, and encoding](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/brazil/markdown/platform-security/instance-security-hardening-settings/validation-sanitization-encoding.md)

</td></tr><tr><td>

Security risk

</td><td>

-   Severity score: High
-   CVSS rating:8.8
-   Security risk details: Uncontrolled JavaScript risks Cross-Site Scripting \(XSS\) attacks, enabling malicious actors to inject and execute harmful scripts in the user's browser. Such attacks can lead to session hijacking, credential theft, and compromise of sensitive data.

</td></tr><tr><td>

Functional impact

</td><td>

None

</td></tr><tr><td>

Dependencies and prerequisites

</td><td>

None

</td></tr></tbody>
</table>**Parent Topic:**[Validation, sanitization, and encoding](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/brazil/markdown/platform-security/instance-security-hardening-settings/validation-sanitization-encoding.md)