3.3

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3.1

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CVE-2025-65961

CVE-2025-65961: Contao is vulnerable to cross-site scripting in templates

Impact

It is possible to inject code into the template output that will be executed in the browser in the front end and back end.

Patches

Update to Contao 4.13.57, 5.3.42 or 5.6.5.

Workarounds

Do not use the affected templates or patch them manually.

Refsources

https://contao.org/en/security-advisories/cross-site-scripting-in-templates

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-65961

CVE-2025-65961:

3.3

CVSS Score

3.1

-

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Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
contao/core-bundle	composer	>= 4.0.0, < 4.13.57	4.13.57
contao/core-bundle	composer	>= 5.0.0-RC1, < 5.3.42	5.3.42
contao/core-bundle	composer	>= 5.4.0-RC1, < 5.6.5	5.6.5

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is a cross-site scripting (XSS) issue within Contao's templating system and various components that render user-controllable data. The analysis of the patches between versions 4.13.56 and 4.13.57 reveals multiple instances where data was being rendered in HTML templates without proper escaping for the specific context (e.g., HTML attributes vs. HTML text).

The root causes are:

Improper Escaping: Several components, such as ContentAccordion, ModuleSearch, and PageRegular, were directly embedding variables into HTML attributes or content without using the correct escaping functions. For example, values for style, content, title, and placeholder attributes were not sanitized, allowing attackers to break out of the attribute and inject malicious code.
Incorrect Templating Logic: The Template::once() helper method had a logical flaw. It would store the result of a callback and return it on subsequent calls. However, it replaced the callback with its result. If the result was a string (e.g., user input), the next call would return the raw string, bypassing the intended logic and potentially rendering unescaped data.

The patches consistently apply context-aware escaping using StringUtil::specialcharsAttribute() for HTML attributes and StringUtil::specialchars() for HTML content, and fix the logic in the Template::once() method. These changes prevent the injection and execution of arbitrary scripts in the browser.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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3.3

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Basic Information

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CVE-2025-65961: Contao is vulnerable to cross-site scripting in templates

Impact

Patches

Workarounds

Refsources

CVE-2025-65961:

3.3

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Technical Details

Technical Details

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Root Cause Analysis

Vulnerable functions

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WAF Rule

Reasoning

Technical Details

3.3

3.3

Basic Information

Basic Information

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Root Cause Analysis

Vulnerable functions

CVE-2025-65961: Contao is vulnerable to cross-site scripting in templates

Impact

Patches

Workarounds

Refsources

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
Miggo AI