| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-xcj9-5m2h-648r | Mermaid: Improper sanitization of `classDefs` in diagrams leads to CSS injection |
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Wed, 27 May 2026 14:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Mon, 25 May 2026 11:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Mermaid Project
Mermaid Project mermaid |
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| Vendors & Products |
Mermaid Project
Mermaid Project mermaid |
Fri, 22 May 2026 22:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Versions 10.9.5 and prior, in addition to 11.0.0-alpha.1 through 11.12.0 are vulnerable to CSS injection through improper sanitization. The state diagram (and any other diagram type that routes user-controlled style strings through the createCssStyles parser) captures classDef values using an unrestricted regex that matches everything up to a newline. That value then flows unsanitized through addStyleClass() into createCssStyles() and is assigned to style.innerHTML, so a closing brace (}) in the value terminates the generated CSS selector and turns everything after it into a new CSS rule on the page. This enables page defacement, user tracking via url() callbacks, and DOM attribute exfiltration. This issue has been fixed in versions 10.9.6 and 11.15.0. If developers are unable to immediately upgrade, they can work around this issue by setting "securityLevel": "sandbox", which prevents the issue by rendering the mermaid diagram in a sandboxed <iframe>. | |
| Title | Mermaid: Improper sanitization of `classDefs` in diagrams leads to CSS injection | |
| Weaknesses | CWE-94 | |
| References |
|
|
| Metrics |
cvssV4_0
|
Projects
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-05-27T13:25:35.445Z
Reserved: 2026-04-17T12:59:15.739Z
Link: CVE-2026-41148
Updated: 2026-05-27T13:25:32.895Z
Status : Deferred
Published: 2026-05-22T23:16:53.593
Modified: 2026-05-26T19:37:00.120
Link: CVE-2026-41148
No data.
OpenCVE Enrichment
Updated: 2026-05-25T11:30:23Z
Github GHSA