OneUptime is a solution for monitoring and managing online services. Prior to 10.0.23, the Markdown viewer component renders Mermaid diagrams with securityLevel: "loose" and injects the SVG output via innerHTML. This configuration explicitly allows interactive event bindings in Mermaid diagrams, enabling XSS through Mermaid's click directive which can execute arbitrary JavaScript. Any field that renders markdown (incident descriptions, status page announcements, monitor notes) is vulnerable. This vulnerability is fixed in 10.0.23.
Metrics
Affected Vendors & Products
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References
History
Thu, 12 Mar 2026 21:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | OneUptime is a solution for monitoring and managing online services. Prior to 10.0.23, the Markdown viewer component renders Mermaid diagrams with securityLevel: "loose" and injects the SVG output via innerHTML. This configuration explicitly allows interactive event bindings in Mermaid diagrams, enabling XSS through Mermaid's click directive which can execute arbitrary JavaScript. Any field that renders markdown (incident descriptions, status page announcements, monitor notes) is vulnerable. This vulnerability is fixed in 10.0.23. | |
| Title | OneUptime: Stored XSS via Mermaid Diagram Rendering (securityLevel: "loose") | |
| Weaknesses | CWE-79 | |
| References |
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| Metrics |
cvssV3_1
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-03-12T21:29:00.510Z
Reserved: 2026-03-11T21:16:21.659Z
Link: CVE-2026-32308
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
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