CVE-2021-21383: XSS in Wiki.js
Wiki.js an open-source wiki app built on Node.js. Wiki.js before version 2.5.191 is vulnerable to stored cross-site scripting through mustache expressions in code blocks. This vulnerability exists due to mustache expressions being parsed by Vue during content injection even though it is contained within a <pre> element. By creating a crafted wiki page, a malicious Wiki.js user may stage a stored cross-site scripting attack. This allows the attacker to execute malicious JavaScript when the page is viewed by other users. For an example see referenced GitHub Security Advisory. Commit 5ffa189383dd716f12b56b8cae2ba0d075996cf1 fixes this vulnerability by adding the v-pre directive to all <pre> tags during the render.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is CVE-2021-21383?
CVE-2021-21383 is a vulnerability in Wiki.js, an open-source wiki app built on Node.js, where version 2.5.191 and earlier are vulnerable to stored cross-site scripting.
How severe is CVE-2021-21383?
CVE-2021-21383 has a severity score of 5.4, which is considered high.
How does CVE-2021-21383 work?
CVE-2021-21383 allows an attacker to perform stored cross-site scripting by injecting malicious code into mustache expressions in code blocks.
Which software versions are affected by CVE-2021-21383?
Version 2.5.191 and earlier of Wiki.js are affected by CVE-2021-21383.
How can I fix the CVE-2021-21383 vulnerability?
To fix the CVE-2021-21383 vulnerability, upgrade Wiki.js to version 2.5.191 or later.