CVE-2026-32308

HIGH EPSS 12.9%
Published Mar 13, 20263mo ago · Modified Jun 17, 20261w ago
7.6 CVSS 3.1
High
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Published Mar 13, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
7.6
Exploitability
2.3
Impact
4.7
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction Required
Scope Changed
Confidentiality High
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
12.9% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 1

VendorProductVersionRange
hackerbayoneuptime* <10.0.23

References 1

  • github.com https://github.com/OneUptime/oneuptime/security/advisories/GHSA-wvh5-6vjm-23qh
    ExploitMitigationVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.