CVE-2025-53837: Code Injection (CVSS 9.9)

Description

XWiki Rendering is a generic rendering system that converts textual input in a given syntax (wiki syntax, HTML, etc) into another syntax (XHTML, etc). Prior to versions 14.10.2 and 15.0 RC1, any user who can edit their own user profile or any other document can execute arbitrary script macros including Groovy and Python macros that allow remote code execution including unrestricted read and write access to all wiki contents. The reason is that rendering output is included as content of HTML macros without further escaping and it is thus possible to close the HTML macro and inject script macros that are executed with programming rights. This has been patched in XWiki 14.10.2 and 15.0 RC1 by making sure that rendering output cannot close the surrounding HTML macro. A possible workaround is available. It is, in principle, possible to add escaping to all places where rendering output is used in wiki documents, but at the moment there is no list of them.

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CVSS v3.1 Score

9.9

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0064

Probability of exploitation

0.50%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-95 CWE-95

References

Other References

https://github.com/xwiki/xwiki-rendering/commit/92bc8095ed3acce15ab200c8525e1623b4898be5 https://github.com/xwiki/xwiki-rendering/releases/tag/xwiki-rendering-14.10.2 https://github.com/xwiki/xwiki-rendering/releases/tag/xwiki-rendering-15.0-rc-1 https://github.com/xwiki/xwiki-rendering/security/advisories/GHSA-26vp-8gxg-v4pg https://jira.xwiki.org/browse/XRENDERING-693 https://jira.xwiki.org/browse/XWIKI-20313 https://jira.xwiki.org/browse/XWIKI-20327

Frequently Asked Questions

What is CVE-2025-53837? +

XWiki Rendering is a generic rendering system that converts textual input in a given syntax (wiki syntax, HTML, etc) into another syntax (XHTML, etc). Prior to versions 14.10.2 and 15.0 RC1, any user who can edit their own user profile or any other document can execute arbitrary script macros including Groovy and Python macros that allow remote code execution including unrestricted read and write access to all wiki contents. The reason is that rendering output is included as content of HTML macros without further escaping and it is thus possible to close the HTML macro and inject script macros that are executed with programming rights. This has been patched in XWiki 14.10.2 and 15.0 RC1 by making sure that rendering output cannot close the surrounding HTML macro. A possible workaround is available. It is, in principle, possible to add escaping to all places where rendering output is used in wiki documents, but at the moment there is no list of them. It has a CVSS v3.1 base score of 9.9 (CRITICAL).

How severe is CVE-2025-53837? +

CVE-2025-53837 has a CVSS v3.1 score of 9.9 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0064, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2025-53837? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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