CVE-2021-21383
MEDIUM EPSS 54.4%
Published Mar 18, 20215y ago · Modified Jun 17, 20262w ago
5.4 CVSS 3.1
Published Mar 18, 2021 5y ago
Last Modified Jun 17, 2026 2w ago
Description
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction Required
Scope Changed
Confidentiality Low
Integrity Low
Availability None
Threat Intelligence
EPSS Exploit Probability
54.4% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available
Weaknesses 1
CWE-79 Cross-site Scripting Injection
Affected Products 1
| Vendor | Product | Version | Range |
|---|---|---|---|
| requarks | wiki.js | * | <2.5.191 |
References 3
- github.com https://github.com/Requarks/wiki/commit/5ffa189383dd716f12b56b8cae2ba0d075996cf1
- github.com https://github.com/Requarks/wiki/releases/tag/2.5.191
- github.com https://github.com/Requarks/wiki/security/advisories/GHSA-6xx4-m8gx-826r
Remediation
- github.com https://github.com/Requarks/wiki/commit/5ffa189383dd716f12b56b8cae2ba0d075996cf1
- github.com https://github.com/Requarks/wiki/security/advisories/GHSA-6xx4-m8gx-826r