lakeFS vulnerable to stored XSS in rendered markdown previews via raw HTML
lakeFS is an open-source tool that transforms object storage into a Git-like repositories. Prior to version 1.81.1 of the open source edition and 1.84.0 of the enterprise edition, lakeFS Web UI renders markdown files from repository objects without sanitizing the resulting HTML. A user with write access to any repository branch can commit a `.md` object containing arbitrary HTML/JavaScript. Any other user who opens that object, or who navigates to a repository or directory containing a malicious `README.md`, executes the attacker-supplied script in their own authenticated session. lakeFS fixes the issue in v1.81.1 and lakeFS Enterprise fixes the issue in in v1.84.0. Enterprise customers using older versions can temporarily disable Markdown rendering by adding YAML to their config. No workaround exists for OSS release. Users are advised to upgrade to the latest version for both lakeFS and lakeFS-Enterprise.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-48026
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 12:09 UTC · Revision 1
Source evidence
lakeFS vulnerable to stored XSS in rendered markdown previews via raw HTML
core-osv · Original sourcePublished 7 Aug 2026, 22:29 UTC
lakeFS is an open-source tool that transforms object storage into a Git-like repositories. Prior to version 1.81.1 of the open source edition and 1.84.0 of the enterprise edition, lakeFS Web UI renders markdown files from repository objects without sanitizing the resulting HTML. A user with write access to any repository branch can commit a `.md` object containing arbitrary HTML/JavaScript. Any other user who opens that object, or who navigates to a repository or directory containing a malicious `README.md`, executes the attacker-supplied script in their own authenticated session. lakeFS fixes the issue in v1.81.1 and lakeFS Enterprise fixes the issue in in v1.84.0. Enterprise customers using older versions can temporarily disable Markdown rendering by adding YAML to their config. No workaround exists for OSS release. Users are advised to upgrade to the latest version for both lakeFS and lakeFS-Enterprise.
osv:CVE-2026-48026
Complete source record
{
"id": "4462184b4c477aa75eb98a04a3b84b4ff73255f0d7c5e833fc050a87b3398976",
"url": "https://osv.dev/vulnerability/CVE-2026-48026",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "lakeFS vulnerable to stored XSS in rendered markdown previews via raw HTML",
"summary": "lakeFS is an open-source tool that transforms object storage into a Git-like repositories. Prior to version 1.81.1 of the open source edition and 1.84.0 of the enterprise edition, lakeFS Web UI renders markdown files from repository objects without sanitizing the resulting HTML. A user with write access to any repository branch can commit a `.md` object containing arbitrary HTML/JavaScript. Any other user who opens that object, or who navigates to a repository or directory containing a malicious `README.md`, executes the attacker-supplied script in their own authenticated session. lakeFS fixes the issue in v1.81.1 and lakeFS Enterprise fixes the issue in in v1.84.0. Enterprise customers using older versions can temporarily disable Markdown rendering by adding YAML to their config. No workaround exists for OSS release. Users are advised to upgrade to the latest version for both lakeFS and lakeFS-Enterprise.",
"evidence": "osv:CVE-2026-48026",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-48026",
"aliases": [
"CVE-2026-48026",
"GHSA-c2r5-5j4w-2xff"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/treeverse/lakefs",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "fc5b8f529f56e3ddf96fb228730547496da45c83"
},
{
"fixed": "5c95b7e1ce5e32adbbaf507a4865df738d1823b4"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "1.81.1"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"introduced": "0"
},
{
"fixed": "1.84.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
}
]
}
}
],
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48026.json"
}
}
],
"modified": "2026-10-28T02:30:28.354537494Z",
"provider": "osv",
"references": [
"https://github.com/treeverse/lakeFS/blob/77539527e987fb05c27e3e74c59c0a46a05c47a0/webui/src/pages/repositories/repository/fileRenderers/useMarkdownProcessor.tsx",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48026.json",
"https://github.com/treeverse/lakeFS/security/advisories/GHSA-c2r5-5j4w-2xff",
"https://nvd.nist.gov/vuln/detail/CVE-2026-48026"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48026.json"
}
},
"related_cves": [
{
"value": "CVE-2026-48026",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 495273,
"published_at": "2026-08-07T22:29:36.173+00:00"
}