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CVE-2021-21379

7.7 · HIGH

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it.

Published Mar 12, 2021CWE-281EPSS 0.48%

Overview

CVE-2021-21379 is a high-severity vulnerability. It was published on March 12, 2021 and has a CVSS 3.1 base score of 7.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. In affected versions of XWiki Platform, the `{{wikimacrocontent}}` executes the content with the rights of the wiki macro author instead of the caller of that wiki macro. This makes possible to inject scripts through it and they will be executed with the rights of the wiki macro (very often a user which has Programming rights). Fortunately, no such macro exists by default in XWiki Standard but one could have been created or installed with an extension. This vulnerability has been patched in versions XWiki 12.6.3, 11.10.11 and 12.8-rc-1. There is no easy workaround other than disabling the affected macros. Inserting content in a safe way or knowing what is the user who called the wiki macro is not easy.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/xwiki/xwiki-platform/security/advisories/GHSA-v662-xpcc-9xf6Refjira.xwiki.org/browse/XWIKI-17759GitHubgithub.com/xwiki/xwiki-platform/security/advisories/GHSA-v662-xpcc-9xf6Refjira.xwiki.org/browse/XWIKI-17759

How CyberStrike helps

Frequently asked questions

What is CVE-2021-21379?

CVE-2021-21379 is a high-severity vulnerability. It was published on March 12, 2021 and has a CVSS 3.1 base score of 7.7 (HIGH).

How severe is CVE-2021-21379?

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-21379?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-21379?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-21379 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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