CVE-2026-32308

moderate-risk
Published 2026-03-13

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.

Do I need to act?

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0.05% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.6/10 High
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Hackerbay

References (1)

Exploit https://github.com/OneUptime/oneuptime/security/advisories/GHSA-wvh5-6vjm-23qh
32
/ 100
moderate-risk
Severity 27/34 · High
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal