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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact High

Integrity Impact Low

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00032.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
OneUptime oneuptime affected
Version Status Constraints
< 10.0.23 affected
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No data.

No data.

Vendor Product Confidence Versions
Oneuptime Oneuptime 100%
Version Status Scheme Platform
[0,10.0.23)
 affected semver —

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/OneUptime/oneuptime/security/advisories/GHSA-wvh5-6vjm-23qh cve-icon
History

Fri, 13 Mar 2026 10:00:00 +0000

Type Values Removed Values Added
First Time appeared Oneuptime
Oneuptime oneuptime
Vendors & Products Oneuptime
Oneuptime oneuptime

Thu, 12 Mar 2026 21:45:00 +0000

Type Values Removed Values Added
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.
Title OneUptime: Stored XSS via Mermaid Diagram Rendering (securityLevel: "loose")
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 7.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-12T21:29:00.510Z

Reserved: 2026-03-11T21:16:21.659Z

Link: CVE-2026-32308

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-13T09:49:38Z

Weaknesses