What is CVE-2026-32308?

CVE-2026-32308 is a high-severity vulnerability in Oneuptime, classified under Cross-site Scripting. CVSS score: 7.6/10. Published 2026-03-12.

How severe is CVE-2026-32308?

High severity. CVSS v3 base score is 7.6 out of 10.

XSS in Oneuptime

CVE-2026-32308

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 explicit…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.001 (16.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N.

Affected products

Oneuptime — versions < 10.0.23

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

https://github.com/OneUptime/oneuptime/security/advisories/GHSA-wvh5-6vjm-23qh (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-32308?: CVE-2026-32308 is a high-severity vulnerability in Oneuptime, classified under Cross-site Scripting. CVSS score: 7.6/10. Published 2026-03-12.
How severe is CVE-2026-32308?: High severity. CVSS v3 base score is 7.6 out of 10.