CVE-2021-43841: Xwiki platform oldcore Cross-Site Scripting Vulnerability
MODERATECVE-2021-43841 is a MODERATE (CVSS 4.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Xwiki platform oldcore libraries in the Maven ecosystem. The issue involves cross-site scripting by svg upload in xwiki-platform. Remediation is available by upgrading affected packages to version 12.10.6, 13.3RC1.
CVE-2021-43841 at a Glance
Security Impact
CVSS: 4.1
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N).
How to Fix CVE-2021-43841
To remediate this vulnerability, upgrade all affected Xwiki platform oldcore dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>org.xwiki.platform</groupId>
<artifactId>xwiki-platform-oldcore</artifactId>
<version>12.10.6</version>
</dependency>
<dependency>
<groupId>org.xwiki.platform</groupId>
<artifactId>xwiki-platform-oldcore</artifactId>
<version>13.3RC1</version>
</dependency>
<dependency>
<groupId>org.xwiki.platform</groupId>
<artifactId>xwiki-platform-tool-configuration-resources</artifactId>
<version>13.3RC1</version>
</dependency>
<dependency>
<groupId>org.xwiki.platform</groupId>
<artifactId>xwiki-platform-tool-configuration-resources</artifactId>
<version>12.10.6</version>
</dependency>
Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=org.xwiki.platform
How to Check if You Are Affected
To determine whether your Java application is affected by CVE-2021-43841, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=org.xwiki.platform
Analyze the terminal output to locate any version of Xwiki platform oldcore in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 12.10.6), your application is affected.
Note: The mvn dependency:tree -Dincludes=org.xwiki.platform command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Xwiki platform oldcore, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2021-43841 Affected Xwiki platform oldcore Versions
4 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.xwiki.platform:xwiki-platform-oldcore
|
Maven |
< 12.10.6
|
12.10.6
|
|
org.xwiki.platform:xwiki-platform-oldcore
|
Maven |
≥ 13.0
< 13.3RC1
|
13.3RC1
|
|
org.xwiki.platform:xwiki-platform-tool-configuration-resources
|
Maven |
≥ 13.0
< 13.3RC1
|
13.3RC1
|
|
org.xwiki.platform:xwiki-platform-tool-configuration-resources
|
Maven |
< 12.10.6
|
12.10.6
|
References
Frequently Asked Questions
What is CVE-2021-43841?
Which Xwiki platform oldcore versions are affected?
What version fixes CVE-2021-43841?
Is xwiki-platform-oldcore affected?
Is xwiki-platform-tool-configuration-resources affected?
What is the CVSS score of CVE-2021-43841?
What CWE is associated with CVE-2021-43841?
How can I check Maven dependencies for CVE-2021-43841?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-9jq9-c2cv-pcrj",
"modified" : "2022-02-11T21:08:41Z",
"published" : "2022-02-10T22:42:48Z",
"aliases" : [ "CVE-2021-43841" ],
"summary" : "Cross-site Scripting by SVG upload in xwiki-platform",
"details" : "### Impact\nWhen using default XWiki configuration, it's possible for an attacker to upload an SVG containing a script executed when executing the download action on the file. \n\n### Patches\nThis problem has been patched so that the default configuration doesn't allow to display the SVG files in the browser.\n\n### Workarounds\nThis issue can be fixed without the patch by setting properly the configuration to download or display files, see: https://www.xwiki.org/xwiki/bin/view/Documentation/AdminGuide/Attachments#HAttachmentdisplayordownload\n\n### References\nhttps://jira.xwiki.org/browse/XWIKI-18368\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [Jira](http://jira.xwiki.org)\n* Email us at [security ML](mailto:security@xwiki.org)\n",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.xwiki.platform:xwiki-platform-oldcore"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "12.10.6"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Maven",
"name" : "org.xwiki.platform:xwiki-platform-oldcore"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "13.0"
}, {
"fixed" : "13.3RC1"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 13.2"
}
}, {
"package" : {
"ecosystem" : "Maven",
"name" : "org.xwiki.platform:xwiki-platform-tool-configuration-resources"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "13.0"
}, {
"fixed" : "13.3RC1"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 13.2"
}
}, {
"package" : {
"ecosystem" : "Maven",
"name" : "org.xwiki.platform:xwiki-platform-tool-configuration-resources"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "12.10.6"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-9jq9-c2cv-pcrj"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-43841"
}, {
"type" : "WEB",
"url" : "https://github.com/xwiki/xwiki-platform/commit/5853d492b3a274db0d94d560e2a5ea988a271c62"
}, {
"type" : "WEB",
"url" : "https://github.com/xwiki/xwiki-platform"
}, {
"type" : "WEB",
"url" : "https://jira.xwiki.org/browse/XWIKI-18368"
}, {
"type" : "WEB",
"url" : "https://www.xwiki.org/xwiki/bin/view/Documentation/AdminGuide/Attachments#HAttachmentdisplayordownload"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-79" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2022-02-07T16:42:20Z",
"nvd_published_at" : "2022-02-04T23:15:00Z"
}
}