Vulnerability · Published Aug 19, 2025 · Assigned by GitHub_M

CVE-2025-54880Mermaid does not properly sanitize architecture diagram iconText leading to XSS

Medium 5.1

In plain English

A medium-severity cross-site scripting in mermaid from mermaid-js. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)5.1Medium

Exploit odds (30 days)0.4%top 64.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 11.9.0 and earlier, user supplied input for architecture diagram icons is passed to the d3 html() method, creating a sink for cross site scripting. This vulnerability is fixed in 11.10.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Ubuntu:22.04:LTS	node-mermaid	no fix listed	UBUNTU-CVE-2025-54880
Ubuntu:26.10	node-mermaid	no fix listed	UBUNTU-CVE-2025-54880
npm	mermaid	11.10.0	GHSA-8gwm-58g9-j8pw

Affected products (as reported)

Vendor	Product	Versions
mermaid-js	mermaid	>= 11.1.0, < 11.10.0

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

References

https://github.com/mermaid-js/mermaid/security/advisories/GHSA-8gwm-58g9-j8pw x_refsource_CONFIRM
https://github.com/mermaid-js/mermaid/commit/2aa83302795183ea5c65caec3da1edd6cb4791fc x_refsource_MISC
https://github.com/mermaid-js/mermaid/commit/734bde38777c9190a5a72e96421c83424442d4e4 x_refsource_MISC