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CVE

CVE-2026-32308

OneUptime: Stored XSS via Mermaid Diagram Rendering (securityLevel: "loose")
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CVE

CVE-2026-32308

OneUptime: Stored XSS via Mermaid Diagram Rendering (securityLevel: "loose")

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.6
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32308.json, https://github.com/OneUptime/oneuptime/security/advisories/GHSA-wvh5-6vjm-23qh, https://nvd.nist.gov/vuln/detail/CVE-2026-32308

Severity

7.6

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.6
EPSS Probability
0.00053%
EPSS Percentile
0.16954%
Introduced Version
0
Fix Available
bbd6bdac1229598d880ec7b02219ae72af221206

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