CVE-2021-43841

Public Exploit
XSS by SVG upload in xwiki-platform

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.

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.57%
Vendor Advisory xwiki.org Vendor Advisory xwiki.org
Affected: xwiki xwiki-platform
Published at:
Updated at:

References

Link Tags
https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-9jq9-c2cv-pcrj third party advisory
https://github.com/xwiki/xwiki-platform/commit/5853d492b3a274db0d94d560e2a5ea988a271c62 third party advisory patch
https://jira.xwiki.org/browse/XWIKI-18368 exploit patch vendor advisory
https://www.xwiki.org/xwiki/bin/view/Documentation/AdminGuide/Attachments#HAttachmentdisplayordownload vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-43841?
CVE-2021-43841 has been scored as a medium severity vulnerability.
How to fix CVE-2021-43841?
To fix CVE-2021-43841, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-43841 being actively exploited in the wild?
It is possible that CVE-2021-43841 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-43841?
CVE-2021-43841 affects xwiki xwiki-platform.
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