CVE-2025-54881

Mermaid improperly sanitizes of sequence diagram labels leading to XSS

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.

Category

5.3
CVSS
Severity: Medium
CVSS 4.0 •
EPSS 0.04%
Affected: mermaid-js mermaid
Published at:
Updated at:

References

Link Tags
https://github.com/mermaid-js/mermaid/security/advisories/GHSA-7rqq-prvp-x9jh
https://github.com/mermaid-js/mermaid/commit/5c69e5fdb004a6d0a2abe97e23d26e223a059832
https://github.com/mermaid-js/mermaid/commit/685516a85ec1df64cefd4fd15f26533be87d458e

Frequently Asked Questions

What is the severity of CVE-2025-54881?
CVE-2025-54881 has been scored as a medium severity vulnerability.
How to fix CVE-2025-54881?
To fix CVE-2025-54881, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-54881 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-54881 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-54881?
CVE-2025-54881 affects mermaid-js mermaid.
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