CVE-2025-46558: org.xwiki.contrib.markdown:syntax-markdown-commonmark12 vulnerable to XSS via Markdown content
First published: Wed Apr 30 2025(Updated: )
### Impact The Markdown syntax is vulnerable to XSS through HTML. In particular, using Markdown syntax, it's possible for any user to embed Javascript code that will then be executed on the browser of any other user visiting either the document or the comment that contains it. In the instance that this code is executed by a user with admins or programming rights, this issue compromises the confidentiality, integrity and availability of the whole XWiki installation. To reproduce, on an instance where the CommonMark Markdown Syntax 1.2 extension is installed, log in as a user without script rights. Edit a document and set its syntax to Markdown. Then , add the content `<script>alert("XSS")</script>` and refresh the page. If an alert appears containing "XSS", then the instance is vulnerable. ### Patches This has been patched in version 8.9 of the CommonMark Markdown Syntax 1.2 extension. ### Workarounds We're not aware of any workaround except upgrading. ### References * https://jira.xwiki.org/browse/MARKDOWN-80 * https://github.com/xwiki-contrib/syntax-markdown/commit/d136472d6e8a47981a0ede420a9096f88ffa5035
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| maven/org.xwiki.contrib.markdown:syntax-markdown-commonmark12 | >=8.2<8.9 | 8.9 |
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Reference Links
- https://github.com/xwiki-contrib/syntax-markdown/security/advisories/GHSA-8g2j-rhfh-hq3r
- https://github.com/xwiki-contrib/syntax-markdown/commit/d136472d6e8a47981a0ede420a9096f88ffa5035
- https://jira.xwiki.org/browse/MARKDOWN-80
- https://nvd.nist.gov/vuln/detail/CVE-2025-46558
- https://github.com/advisories/GHSA-8g2j-rhfh-hq3r (Advisory)
Frequently Asked Questions
What is the severity of CVE-2025-46558?
CVE-2025-46558 has a high severity due to its potential for XSS attacks allowing execution of malicious scripts in users' browsers.
How do I fix CVE-2025-46558?
To fix CVE-2025-46558, update to version 8.9 of the org.xwiki.contrib.markdown:syntax-markdown-commonmark12 package.
What is the vulnerability type of CVE-2025-46558?
CVE-2025-46558 is classified as a cross-site scripting (XSS) vulnerability affecting Markdown syntax.
Which software is affected by CVE-2025-46558?
CVE-2025-46558 affects the org.xwiki.contrib.markdown:syntax-markdown-commonmark12 package versions between 8.2 and 8.9.
Can CVE-2025-46558 affect all users?
Yes, CVE-2025-46558 can potentially affect all users who visit documents or comments containing the vulnerable Markdown syntax.
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