Medium
Mermaid improperly sanitizes of sequence diagram labels leading to XSS
Type: advisorySources: OSV
Mermaid is a JavaScript based diagramming and charting tool that uses Markdown-inspired text definitions and a renderer to create and modify complex diagrams. In the default configuration of mermaid 10.9.0-rc.1 to 11.9.0, user supplied input for sequence diagram labels is passed to innerHTML during calculation of element size, causing XSS.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-54881
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 05:56 UTC · Revision 1
Source evidence
Mermaid improperly sanitizes of sequence diagram labels leading to XSS
core-osv · Original sourcePublished 19 Aug 2025, 17:04 UTC
Mermaid is a JavaScript based diagramming and charting tool that uses Markdown-inspired text definitions and a renderer to create and modify complex diagrams. In the default configuration of mermaid 10.9.0-rc.1 to 11.9.0, user supplied input for sequence diagram labels is passed to innerHTML during calculation of element size, causing XSS.
osv:CVE-2025-54881
Complete source record
{
"id": "32f6f25d89e25295d02bc3949f714a1f4e79f33c367ead39b286efc40d9030cd",
"url": "https://osv.dev/vulnerability/CVE-2025-54881",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Mermaid improperly sanitizes of sequence diagram labels leading to XSS",
"summary": "Mermaid is a JavaScript based diagramming and charting tool that uses Markdown-inspired text definitions and a renderer to create and modify complex diagrams. In the default configuration of mermaid 10.9.0-rc.1 to 11.9.0, user supplied input for sequence diagram labels is passed to innerHTML during calculation of element size, causing XSS.",
"evidence": "osv:CVE-2025-54881",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2025-54881",
"aliases": [
"CVE-2025-54881",
"GHSA-7rqq-prvp-x9jh"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/mermaid-js/mermaid",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "5c69e5fdb004a6d0a2abe97e23d26e223a059832"
},
{
"fixed": "685516a85ec1df64cefd4fd15f26533be87d458e"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "10.9.0-rc.1"
},
{
"last_affected": "11.9.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "5c69e5fdb004a6d0a2abe97e23d26e223a059832"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "685516a85ec1df64cefd4fd15f26533be87d458e"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"mermaid@11.8.1",
"@mermaid-js/tiny@11.8.1",
"@mermaid-js/parser@0.6.1",
"mermaid@11.8.0",
"@mermaid-js/tiny@11.8.0",
"@mermaid-js/parser@0.6.0",
"mermaid@11.7.0",
"@mermaid-js/tiny@11.7.0",
"@mermaid-js/parser@0.5.0",
"@mermaid-js/mermaid-zenuml@0.2.1",
"@mermaid-js/layout-elk@0.1.8",
"mermaid@11.6.0",
"@mermaid-js/parser@0.4.0",
"mermaid@11.5.0",
"@mermaid-js/layout-elk@0.1.7",
"mermaid@11.4.1",
"@mermaid-js/layout-elk@0.1.6",
"mermaid@11.4.0",
"mermaid@11.3.0",
"@mermaid-js/layout-elk@0.1.5",
"mermaid@11.2.1",
"@mermaid-js/layout-elk@0.1.4",
"mermaid@11.2.0",
"mermaid@11.1.1",
"mermaid@11.1.0",
"@mermaid-js/parser@0.3.0",
"@mermaid-js/layout-elk@0.1.3",
"@mermaid-js/layout-elk@0.1.2",
"mermaid@11.0.2",
"@mermaid-js/parser@0.2.0",
"@mermaid-js/layout-elk@0.1.1",
"mermaid@11.0.1",
"v11.0.0",
"v10.9.0",
"v10.7.0",
"v10.4.0",
"v10.3.0",
"v10.1.0",
"9.1.5",
"9.1.3",
"9.1.2",
"8.13.11",
"8.13.10",
"8.13.7",
"8.13.6",
"8.13.5",
"8.12.1",
"8.11.4",
"8.11.3",
"8.11.0-rc2",
"8.9.3",
"8.9.1",
"8.8.3",
"8.8.0",
"8.7.0",
"8.6.2",
"8.6.0",
"8.5.2",
"untagged-566ebfbf21141b604025",
"8.5.1",
"untagged-31c93788afe260d914bb",
"8.4.8",
"untagged-7651dabb407ecd5631ce",
"8.4.6",
"untagged-f43366252632a1a42020",
"8.4.4",
"8.2.0",
"8.3.0",
"8.2.6",
"8.2.5",
"8.2.4",
"8.2.3",
"8.2.2",
"8.1.0",
"8.2.1",
"7.0.5",
"7.0.3",
"7.0.2",
"7.0.0",
"6.0.0",
"0.5.7",
"0.5.6",
"0.5.5",
"0.5.4",
"0.5.3",
"0.5.2",
"0.5.1",
"0.5.0",
"0.4.0",
"0.3.5",
"0.3.4",
"0.3.3",
"0.3.2",
"0.3.1",
"0.3.0",
"0.2.16",
"0.2.15",
"0.2.14",
"0.2.13",
"0.2.8",
"0.2.7",
"0.2.6",
"0.2.5",
"0.2.4",
"0.2.3",
"0.2.2",
"0.2.1",
"0.2.0",
"0.1.1",
"0.1.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-54881.json"
}
}
],
"modified": "2026-10-28T02:30:43.025831849Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/54xxx/CVE-2025-54881.json",
"https://github.com/mermaid-js/mermaid/security/advisories/GHSA-7rqq-prvp-x9jh",
"https://nvd.nist.gov/vuln/detail/CVE-2025-54881",
"https://github.com/mermaid-js/mermaid/commit/5c69e5fdb004a6d0a2abe97e23d26e223a059832",
"https://github.com/mermaid-js/mermaid/commit/685516a85ec1df64cefd4fd15f26533be87d458e"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/54xxx/CVE-2025-54881.json"
}
},
"related_cves": [
{
"value": "CVE-2025-54881",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 510870,
"published_at": "2025-08-19T17:04:29.453+00:00"
}