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      <title>CVE-2026-32308 — OneUptime: Stored XSS via Mermaid Diagram Rendering (securityLevel: "loose")</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-32308</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; oneuptime&lt;/p&gt;
&lt;p&gt;OneUptime is a solution for monitoring and managing online services. Prior to 10.0.23, the Markdown viewer component renders Mermaid diagrams with securityLevel: &amp;#34;loose&amp;#34; and injects the SVG output via innerHTML. This configuration explicitly allows interactive event bindings in Mermaid diagrams, enabling XSS through Mermaid&amp;#39;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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; oneuptime&lt;/p&gt;
&lt;p&gt;OneUptime is a solution for monitoring and managing online services. Prior to 10.0.23, the Markdown viewer component renders Mermaid diagrams with securityLevel: &amp;#34;loose&amp;#34; and injects the SVG output via innerHTML. This configuration explicitly allows interactive event bindings in Mermaid diagrams, enabling XSS through Mermaid&amp;#39;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.&lt;/p&gt;</content:encoded>
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