CVE-2021-43841 XSS by SVG upload in xwiki-platform
Attackers can execute scripts via uploaded SVG files in XWiki, potentially leading to code execution or account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-43841?
CVE-2021-43841 is a medium-severity cross-site scripting vulnerability in Xwiki Xwiki, published on 4 Feb 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
XWiki is a generic wiki platform offering runtime services for applications built on top of it. When 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. This problem has been patched so that the default configuration doesn't allow to display the SVG files in the browser. Users are advised to update or to disallow uploads of SVG files.
Weakness: CWE-79
Which versions are affected by CVE-2021-43841?
8 open source packages ship an affected version, including org.xwiki.platform:xwiki-platform-oldcore and org.xwiki.platform:xwiki-platform-tool-configuration-resources. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.xwiki.platform:xwiki-platform-oldcore Maven | All versions | 12.10.6 |
org.xwiki.platform:xwiki-platform-oldcore Maven | All versions | 12.10.6 |
org.xwiki.platform:xwiki-platform-oldcore Maven | From 13.0 | 13.3RC1 |
org.xwiki.platform:xwiki-platform-oldcore Maven | From 13.0 | 13.3RC1 |
org.xwiki.platform:xwiki-platform-tool-configuration-resources Maven | All versions | 12.10.6 |
org.xwiki.platform:xwiki-platform-tool-configuration-resources Maven | All versions | 12.10.6 |
2 more packages
org.xwiki.platform:xwiki-platform-tool-configuration-resources Maven | From 13.0 | 13.3RC1 |
org.xwiki.platform:xwiki-platform-tool-configuration-resources Maven | From 13.0 | 13.3RC1 |
Products include Xwiki Xwiki.
How do I fix CVE-2021-43841?
Upgrade org.xwiki.platform:xwiki-platform-oldcore to a fixed version for your release line: 12.10.6 or 13.3RC1.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2021-43841 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-43841 exists.
Other vulnerabilities in Xwiki Xwiki
- CVE-2025-24893 XWiki Platform Eval Injection
- CVE-2025-53836 XWiki Rendering is vulnerable to RCE attacks when processing nested macros
- CVE-2024-55662 XWiki allows remote code execution through the extension sheet
- CVE-2024-55877 XWiki allows remote code execution from account through macro descriptions and XWiki.XWikiSyntaxMacrosList
- CVE-2024-37901 XWiki Platform vulnerable to remote code execution from account via SearchSuggestConfigSheet
Sources
Also known as GHSA-9jq9-c2cv-pcrj.