CVE-2026-32308
High · 7.6CVSS
7.6
EPSS
0.3%
Published
Mar 13, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | oneuptime | 0 | 10.0.23 |
Related vulnerabilities
- GHSA-wvh5-6vjm-23qh OneUptime: Stored XSS via Mermaid Diagram Rendering (securityLevel: "loose") Same vulnerability
- CVE-2026-33142 OneUptime is a solution for monitoring and managing online services. Also affects oneuptime
- CVE-2026-33143 OneUptime is a solution for monitoring and managing online services. Also affects oneuptime
- GHSA-g5ph-f57v-mwjc OneUptime WhatsApp Webhook Missing Signature Verification Also affects oneuptime
- GHSA-gcg3-c5p2-cqgg OneUptime ClickHouse vulnerable to SQL Injection via unvalidated column identifiers in… Also affects oneuptime
- GHSA-4524-cj9j-g4fj OneUptime: Password Reset Token Logged at INFO Level Also affects oneuptime
- GHSA-p5g2-jm85-8g35 OneUptime ClickHouse SQL Injection via Aggregate Query Parameters Also affects oneuptime
- CVE-2026-32598 OneUptime is a solution for monitoring and managing online services. Also affects oneuptime