CVE-2021-3137 Cross Site Scripting (XSS) in XWiki
Attackers can execute arbitrary scripts in victim browsers by uploading malicious SVG files to the comment section of XWiki.
- 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-2021-3137?
CVE-2021-3137 is a medium-severity cross-site scripting vulnerability in Xwiki Xwiki, published on 20 Jan 2021. 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 12.10.2 allows XSS via an SVG document to the upload feature of the comment section.
Weakness: CWE-79
Which versions are affected by CVE-2021-3137?
2 open source packages ship an affected version, including org.xwiki.commons:xwiki-commons. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.xwiki.commons:xwiki-commons Maven | All versions | 12.10.3 |
org.xwiki.commons:xwiki-commons Maven | All versions | 12.10.3 |
Products include Xwiki Xwiki.
How do I fix CVE-2021-3137?
Upgrade org.xwiki.commons:xwiki-commons to 12.10.3 or later.
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-2021-3137 being exploited?
There is no known exploitation of CVE-2021-3137 in the wild and no public exploit code.
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-43hg-g44q-474q.