CVE-2026-32308
High
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.
SeverityHigh
CVSS7.6
Exploit probability—
ProductHackerbay Oneuptime
PublishedMar 13, 2026
First seenMar 13, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- hackerbay oneuptime10.0.23 or later
- oneuptime10.0.23 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| hackerbay oneuptime | v < 10.0.23 | 10.0.23 |
| oneuptimenpm | v < 10.0.23 | 10.0.23 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.