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CVE-2026-32308— OneUptime: Stored XSS via Mermaid Diagram Rendering (securityLevel: "loose")

Quick assessment

Affected
OneUptime oneuptime
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OneUptime是OneUptime开源的一个全面的解决方案。用于监控和管理您的在线服务。 OneUptime 10.0.23之前版本存在跨站脚本漏洞，该漏洞源于Markdown查看器组件以不安全配置渲染Mermaid图表，可能导致通过Mermaid的点击指令执行跨站脚本攻击。

CVSS 7.6 · High EPSS 0.30% · P21
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I. Basic Information for CVE-2026-32308

Vulnerability Information
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Vulnerability Title
OneUptime: Stored XSS via Mermaid Diagram Rendering (securityLevel: "loose")
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
OneUptime 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OneUptime是OneUptime开源的一个全面的解决方案。用于监控和管理您的在线服务。 OneUptime 10.0.23之前版本存在跨站脚本漏洞，该漏洞源于Markdown查看器组件以不安全配置渲染Mermaid图表，可能导致通过Mermaid的点击指令执行跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OneUptime oneuptime < 10.0.23 -

II. Public POCs for CVE-2026-32308

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III. Intelligence Information for CVE-2026-32308

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Vendor Advisories for CVE-2026-32308 (1)

Same Patch Batch · OneUptime · 2026-03-12 · 3 CVEs total

CVE-2026-32306 10.0 CRITICAL OneUptime ClickHouse SQL Injection via Aggregate Query Parameters
CVE-2026-32598 OneUptime: Password Reset Token Logged at INFO Level

IV. Related Vulnerabilities

Same product: oneuptime
Same vendor: OneUptime
Same weakness: CWE-79

V. Comments for CVE-2026-32308

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