XSS in Requarks Wiki
CVE-2021-21383
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:N.
EPSS exploit prediction
EPSS: 0.009 (57.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Requarks Wiki — versions < 2.5.191
- Requarks Wiki.js
Weakness classification (CWE)
References
- github.com/Requarks/wiki/security/advisories/GHSA-6xx4-m8gx-826r (Exploit, Patch, Third Party Advisory)
- github.com/Requarks/wiki/commit/5ffa189383dd716f12b56b8cae2ba0d075996cf1 (Patch, Third Party Advisory)
- github.com/Requarks/wiki/releases/tag/2.5.191 (Third Party Advisory, Release Notes)
Frequently asked questions
- What is CVE-2021-21383?
- CVE-2021-21383 is a high-severity vulnerability in Requarks Wiki, classified under Cross-site Scripting. CVSS score: 7.6/10. Published 2021-03-18.
- How severe is CVE-2021-21383?
- High severity. CVSS v3 base score is 7.6 out of 10.