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CVE-2021-43861

Incorrect sanitisation function leads to `XSS`

MEDIUM
5.4
CVSS Score
Published: December 30, 2021 at 01:40 PM UTC
Updated: June 17, 2026 at 04:11 AM UTC
2 products affected across 2 vendorsMermaidMermaid

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.9%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mermaid· Mermaid Projectnpm
95%
v < 8.13.8
Affected range stops below 8.13.8, so it looks safe — our inference, not a vendor statement
Mermaid· Mermaid Js
60%
v < 8.13.8
Affected range stops below 8.13.8, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/mermaid-js/mermaid/commit/066b7a0d0bda274d94a2f2d21e4323dab5776d83
x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/mermaid-js/mermaid/releases/tag/8.13.8
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/mermaid-js/mermaid/security/advisories/GHSA-p3rp-vmj9-gv6v

CVSS

5.4MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20CWE-79NVD-CWE-Other

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