High
Open WebUI before 0.11.4 Stored XSS via javascript: URLs in Markdown Links
Type: advisorySources: OSV
Open WebUI before 0.11.4 contains a stored cross-site scripting vulnerability in MarkdownInlineTokens.svelte, which renders markdown link URLs into anchor hrefs without validating their scheme. Authenticated users can embed javascript: links in shared chats that, when clicked by a victim, steal the victim's JWT from local storage, including admins' tokens.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-109288
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 00:55 UTC · Revision 1
Source evidence
Open WebUI before 0.11.4 Stored XSS via javascript: URLs in Markdown Links
core-osv · Original sourcePublished 12 Oct 2026, 16:04 UTC
Open WebUI before 0.11.4 contains a stored cross-site scripting vulnerability in MarkdownInlineTokens.svelte, which renders markdown link URLs into anchor hrefs without validating their scheme. Authenticated users can embed javascript: links in shared chats that, when clicked by a victim, steal the victim's JWT from local storage, including admins' tokens.
osv:CVE-2026-109288
Complete source record
{
"id": "ddbfbf5a180e1cfdfc90b00a39099cbe9345e304f33f719cdcc2e17d02f99134",
"url": "https://osv.dev/vulnerability/CVE-2026-109288",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Open WebUI before 0.11.4 Stored XSS via javascript: URLs in Markdown Links",
"summary": "Open WebUI before 0.11.4 contains a stored cross-site scripting vulnerability in MarkdownInlineTokens.svelte, which renders markdown link URLs into anchor hrefs without validating their scheme. Authenticated users can embed javascript: links in shared chats that, when clicked by a victim, steal the victim's JWT from local storage, including admins' tokens.",
"evidence": "osv:CVE-2026-109288",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-109288",
"aliases": [
"CVE-2026-109288",
"GHSA-wf9m-46cp-c6h6"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/open-webui/open-webui",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "8bd8b4fac5e059578ac0c74b3c18d11139f88b7d"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "0.11.4"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"introduced": "0"
},
{
"fixed": "0.11.4"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
"versions": [
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"v0.11.2",
"v0.11.1",
"v0.11.0",
"v0.10.2",
"v0.10.1",
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"v0.6.42",
"v0.6.41",
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"v0.6.35",
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"v0.6.32",
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"v0.5.18",
"v0.5.17",
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"v0.5.14",
"v0.5.12",
"v0.5.13",
"v0.5.11",
"v0.5.10",
"v0.5.9",
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"v0.5.7",
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"v0.5.5",
"v0.5.4",
"v0.5.3",
"v0.5.2",
"v0.5.1",
"v0.5.0",
"v0.4.8",
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"v0.4.6",
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"v0.2.3",
"v0.2.2",
"v0.2.1",
"v0.2.0",
"v0.1.125",
"v0.1.124",
"v0.1.123",
"v0.1.122",
"v0.1.114",
"v0.1.121",
"v0.1.120",
"v0.1.119",
"v0.1.118",
"v0.1.117",
"v0.1.116",
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"v0.1.108",
"v0.1.113",
"v0.1.112",
"v0.1.111",
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"v0.1.109",
"v0.1.107",
"v0.1.106",
"v0.1.105",
"v0.1.104",
"v0.1.103",
"v0.1.102"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-109288.json"
}
}
],
"modified": "2026-10-28T02:30:41.009369197Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109288.json",
"https://github.com/open-webui/open-webui/security/advisories/GHSA-wf9m-46cp-c6h6",
"https://nvd.nist.gov/vuln/detail/CVE-2026-109288",
"https://www.vulncheck.com/advisories/open-webui-before-0.11.4-stored-xss-via-javascript-urls-in-markdown-links"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109288.json"
}
},
"related_cves": [
{
"value": "CVE-2026-109288",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 508746,
"published_at": "2026-10-12T16:04:50.352+00:00"
}