CVE-2021-43861 : Mermaid is a Javascript based diagramming and charting tool that uses Markdown-i

Mermaid is a Javascript based diagramming and charting tool that uses Markdown-inspired text definitions and a renderer to create and modify complex diagrams. Prior to version 8.13.8, malicious diagrams can run javascript code at diagram readers' machines. Users should upgrade to version 8.13.8 to receive a patch. There are no known workarounds aside from upgrading.

Published 2021-12-30 14:15:08

Updated 2023-07-21 16:44:59

Source GitHub, Inc.

View at NVD, CVE.org

Vulnerability category: Cross site scripting (XSS)Input validation

Products affected by CVE-2021-43861

Mermaid Project » Mermaid » For Node.js
Versions before (<) 8.13.8
cpe:2.3:a:mermaid_project:mermaid:*:*:*:*:*:node.js:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-43861

EPSS FAQ

0.06%

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

~ 23 %

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

CVSS scores for CVE-2021-43861

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
7.2	HIGH	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H	1.2	5.9	GitHub, Inc.
Attack Vector: Network Attack Complexity: Low Privileges Required: High User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2021-43861

CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

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

References for CVE-2021-43861

https://github.com/mermaid-js/mermaid/security/advisories/GHSA-p3rp-vmj9-gv6v

Incorrect sanitisation function leads to `XSS` · Advisory · mermaid-js/mermaid · GitHub
Third Party Advisory
https://github.com/mermaid-js/mermaid/releases/tag/8.13.8

Release 8.13.8 · mermaid-js/mermaid · GitHub
Release Notes;Third Party Advisory
https://github.com/mermaid-js/mermaid/commit/066b7a0d0bda274d94a2f2d21e4323dab5776d83

Merge pull request from GHSA-p3rp-vmj9-gv6v · mermaid-js/mermaid@066b7a0 · GitHub
Patch;Third Party Advisory

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Vulnerability Details : CVE-2021-43861

Products affected by CVE-2021-43861

Exploit prediction scoring system (EPSS) score for CVE-2021-43861

CVSS scores for CVE-2021-43861

CWE ids for CVE-2021-43861

References for CVE-2021-43861