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Security Advisories: GSA_kwCzR0hTQS14Mzd2LTM2d3YtNnY2aM4AAy5a

Cross-site Scripting in org.xwiki.commons:xwiki-commons-xml


The "restricted" mode of the HTML cleaner in XWiki, introduced in version 4.2-milestone-1 and massively improved in version 14.6-rc-1, allowed the injection of arbitrary HTML code and thus cross-site scripting via invalid HTML comments. As a consequence, any code relying on this "restricted" mode for security is vulnerable to JavaScript injection ("cross-site scripting"/XSS). An example are anonymous comments in XWiki where the HTML macro filters HTML using restricted mode:

<!--> <Details Open OnToggle=confirm("XSS")>

When a privileged user with programming rights visits such a comment in XWiki, the malicious JavaScript code is executed in the context of the user session. This allows server-side code execution with programming rights, impacting the confidentiality, integrity and availability of the XWiki instance.

Note that while all versions since 4.2-milestone-1 should be vulnerable, only starting with version 14.6-rc-1 the HTML comment is necessary for the attack to succeed due to another vulnerability that has been patched in version 14.6-rc-1.


This problem has been patched in XWiki 14.10, HTML comments are now removed in restricted mode and a check has been introduced that ensures that comments don't start with >.


There are no known workarounds apart from upgrading to a version including the fix.


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This vulnerability was reported on Intigriti by ynoof @Ynoof5.

Source: GitHub Advisory Database
Origin: Unspecified
Severity: Critical
Classification: General
Published: about 2 months ago
Updated: about 2 months ago

CVSS Score: 9.0
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Identifiers: GHSA-x37v-36wv-6v6h, CVE-2023-29528

Affected Packages

Versions: >= 4.2-milestone-1, < 14.10
Fixed in: 14.10