Update dependency league/commonmark to v2.7.0 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
league/commonmark (source)	2.6.1 -> 2.7.0

GitHub Vulnerability Alerts

CVE-2025-46734

Summary

Cross-site scripting (XSS) vulnerability in the Attributes extension of the league/commonmark library (versions 1.5.0 through 2.6.x) allows remote attackers to insert malicious JavaScript calls into HTML.

Details

The league/commonmark library provides configuration options such as html_input: 'strip' and allow_unsafe_links: false to mitigate cross-site scripting (XSS) attacks by stripping raw HTML and disallowing unsafe links. However, when the Attributes Extension is enabled, it introduces a way for users to inject arbitrary HTML attributes into elements via Markdown syntax using curly braces.

As a result, even with the secure configuration shown above, an attacker can inject dangerous attributes into applications using this extension via a payload such as:

![](){onerror=alert(1)}

Which results in the following HTML:

<p><img onerror="alert(1)" src="" alt="" /></p>

Which causes the JS to execute immediately on page load.

Patches

Version 2.7.0 contains three changes to prevent this XSS attack vector:

• All attributes starting with on are considered unsafe and blocked by default
• Support for an explicit allowlist of allowed HTML attributes
• Manually-added href and src attributes now respect the existing allow_unsafe_links configuration option

Workarounds

If upgrading is not feasible, please consider:

• Disabling the AttributesExtension for untrusted users
• Filtering the rendered HTML through a library like HTMLPurifier

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Release Notes

thephpleague/commonmark (league/commonmark)

v2.7.0

Compare Source

This is a security release to address a potential cross-site scripting (XSS) vulnerability when using the AttributesExtension with untrusted user input.

Added

• Added attributes/allow config option to specify which attributes users are allowed to set on elements (default allows virtually all attributes)

Changed

• The AttributesExtension blocks all attributes starting with on unless explicitly allowed via the attributes/allow config option
• The allow_unsafe_links option is now respected by the AttributesExtension when users specify href and src attributes

v2.6.2

Compare Source

Fixed

• Fixed Attributes extension parsing regression (#​1071)

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