CVE-2025-54881

MEDIUM

mermaid 10.9.0-rc.1-11.9.0 - Cross-Site Scripting via Sequence Diagram Label Input

Title source: llm
STIX 2.1

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. In the default configuration of mermaid 10.9.0-rc.1 to 11.9.0, user supplied input for sequence diagram labels is passed to innerHTML during calculation of element size, causing XSS.

References (3)

Core 3

Scores

CVSS v4 5.3
EPSS 0.0071
EPSS Percentile 48.7%
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (2)
mermaid-js/mermaid >= 10.9.0-rc.1, <= 11.9.0
npm/mermaid 11.0.0-alpha.1 - 11.10.0npm
Published Aug 19, 2025
Tracked Since Feb 18, 2026