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CVE-2026-32308

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

Published: Mar 12, 2026Updated: Mar 17, 2026 Sources: CVE List NVD GHSACWE-79
NVD MITRE
7.6CVSSHIGH
EPSS Score
0.2%
Top 87.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:LUI:RS:CC:HI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

oneuptimeOneUptime
Mixed
Enterprise Software / itsm-monitoring
oneuptimehackerbay
SaaS
Enterprise Software / itsm-monitoring
oneuptimenpmOSS Libraries
oneuptimecommercialEnterprise Softwareaka oneuptime.com
hackerbaycommercialEnterprise Softwareaka oneuptime
npmpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/OneUptime/oneuptime/security/advisories/GHSA-wvh5-6vjm-23qh
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-32308
nvd.nist.gov
https://github.com/OneUptime/oneuptime
github.com
and 1 more references View all →

Timeline

Published
Mar 12, 2026
Last Updated
Mar 17, 2026

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