CVE-2026-32308

HIGH

7.6

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.

CVE Details

CVSS v3.1 Score7.6

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionREQUIRED

Published3/13/2026

Last Modified3/17/2026

Sourcenvd

Honeypot Sightings0

Affected Products

hackerbay:oneuptime

Weaknesses (CWE)

CWE-79

References

https://github.com/OneUptime/oneuptime/security/advisories/GHSA-wvh5-6vjm-23qh(security-advisories@github.com)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.