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
Core References
Vendor Advisory x_refsource_confirm
https://github.com/mermaid-js/mermaid/security/advisories/GHSA-7rqq-prvp-x9jh
Patch x_refsource_misc
https://github.com/mermaid-js/mermaid/commit/5c69e5fdb004a6d0a2abe97e23d26e223a059832
Scores
CVSS v4
5.3
EPSS
0.0002
EPSS Percentile
4.1%
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
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