High
OneUptime: Stored XSS via Mermaid Diagram Rendering (securityLevel: "loose")
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-32308
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 05:14 UTC · Revision 1
Source evidence
OneUptime: Stored XSS via Mermaid Diagram Rendering (securityLevel: "loose")
core-osv · Original sourcePublished 12 Mar 2026, 21:29 UTC
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.
osv:CVE-2026-32308
Complete source record
{
"id": "00c308719d508a20f6e861f606a4df5a549b9360d7254ae1f1b3509d27f6108f",
"url": "https://osv.dev/vulnerability/CVE-2026-32308",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "OneUptime: Stored XSS via Mermaid Diagram Rendering (securityLevel: \"loose\")",
"summary": "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.",
"evidence": "osv:CVE-2026-32308",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-32308",
"aliases": [
"CVE-2026-32308",
"GHSA-wvh5-6vjm-23qh"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/oneuptime/oneuptime",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "bbd6bdac1229598d880ec7b02219ae72af221206"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "10.0.23"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"cpe": "cpe:2.3:a:hackerbay:oneuptime:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "10.0.23"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
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}
],
"modified": "2026-10-28T02:30:33.136051699Z",
"provider": "osv",
"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"
],
"provider_metadata": {
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],
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"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32308.json"
}
},
"related_cves": [
{
"value": "CVE-2026-32308",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 500458,
"published_at": "2026-03-12T21:29:00.51+00:00"
}