---
id: CVE-2026-32308
title: OneUptime is a solution for monitoring and managing online services
summary: >-
  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 explic…
severity: high
cvss: 7.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N'
cwe:
  - CWE-79
vendor: hackerbay
product: oneuptime
affected:
  - oneuptime < 10.0.23
patched:
  - oneuptime 10.0.23
published: '2026-03-13'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T08:10:00.200'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-32308'
references:
  - url: >-
      https://github.com/OneUptime/oneuptime/security/advisories/GHSA-wvh5-6vjm-23qh
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.003
epssPercentile: 0.20787
ingestedAt: '2026-10-07T08:20:03.901Z'
---

## Overview

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

- `oneuptime < 10.0.23`

## Remediation

Upgrade past the affected range:

- `oneuptime 10.0.23`