CVE-2025-46734

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Source
https://cve.org/CVERecord?id=CVE-2025-46734
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-46734.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-46734
Aliases
Downstream
Published
2025-05-05T19:52:59.521Z
Modified
2026-04-10T05:28:39.919370Z
Severity
  • 6.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N CVSS Calculator
Summary
league/commonmark Cross-site Scripting vulnerability in Attributes extension
Details

league/commonmark is a PHP Markdown parser. A 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. 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. 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; and manually-added href and src attributes now respect the existing allow_unsafe_links configuration option. If upgrading is not feasible, please consider disabling the AttributesExtension for untrusted users and/or filtering the rendered HTML through a library like HTMLPurifier.

Database specific 
{
    "cwe_ids": [
        "CWE-79"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/46xxx/CVE-2025-46734.json"
}
References

Affected packages

Git / github.com/thephpleague/commonmark

Affected ranges

Type
GIT
Repo
https://github.com/thephpleague/commonmark
Events
Introduced
fc33ca12575e98e57cdce7d5f38b2ca5335714b3
Fixed
6fbb36d44824ed4091adbcf4c7d4a3923cdb3405

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-46734.json"