CVE-2021-21383 : Wiki.js an open-source wiki app built on Node.js. Wiki.js before version 2.5.191

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.

Published 2021-03-18 17:15:14

Updated 2021-03-24 14:00:11

Source GitHub, Inc.

View at NVD, CVE.org

Vulnerability category: Cross site scripting (XSS)

Products affected by CVE-2021-21383

Requarks » Wiki.js
Versions before (<) 2.5.191
cpe:2.3:a:requarks:wiki.js:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-21383

EPSS FAQ

0.06%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 24 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-21383

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
3.5	LOW	AV:N/AC:M/Au:S/C:N/I:P/A:N	6.8	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: Single Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
5.4	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N	2.3	2.7	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: Required Scope: Changed Confidentiality: Low Integrity: Low Availability: None
7.6	HIGH	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:N	2.3	4.7	GitHub, Inc.
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: Required Scope: Changed Confidentiality: Low Integrity: High Availability: None

CWE ids for CVE-2021-21383

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Assigned by: security-advisories@github.com (Primary)

References for CVE-2021-21383

https://github.com/Requarks/wiki/security/advisories/GHSA-6xx4-m8gx-826r

Stored XSS through code blocks with mustache expressions · Advisory · Requarks/wiki · GitHub
Exploit;Patch;Third Party Advisory
https://github.com/Requarks/wiki/releases/tag/2.5.191

Release 2.5.191 · Requarks/wiki · GitHub
Release Notes;Third Party Advisory
https://github.com/Requarks/wiki/commit/5ffa189383dd716f12b56b8cae2ba0d075996cf1

fix: add v-pre to pre tags at render time · Requarks/wiki@5ffa189 · GitHub
Patch;Third Party Advisory

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Vulnerability Details : CVE-2021-21383

Products affected by CVE-2021-21383

Exploit prediction scoring system (EPSS) score for CVE-2021-21383

CVSS scores for CVE-2021-21383

CWE ids for CVE-2021-21383

References for CVE-2021-21383