Mermaid allows CSS injection applying to sibling elements of the diagram

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0060, the 49th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 6 Aug 2026. New records show when each source confirmed them.

Sources

• GitHub Advisory Database: GHSA-6x64-9x62-f2gx
• OSV: GHSA-6x64-9x62-f2gx
• github.com/mermaid-js/mermaid/security/advisories/GHSA-6x64-9x62-f2gx
• github.com/mermaid-js/mermaid/pull/8022
• github.com/mermaid-js/mermaid/commit/12d472c9ed43f94814b110da8d7a9ae6dd5266ed
• github.com/mermaid-js/mermaid/commit/7e83f1533318b307764d961906a73377266f4c5e
• github.com/mermaid-js/mermaid
• github.com/mermaid-js/mermaid/releases/tag/[email protected]
• github.com/mermaid-js/mermaid/releases/tag/v10.9.8

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.