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CVE-2026-48026— lakeFS vulnerable to stored XSS in rendered markdown previews via raw HTML

Quick assessment

Affected
treeverse lakeFS
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Treeverse lakeFS是Treeverse公司开源的一个提供数据湖版本控制能力的平台。 Treeverse lakefs 1.81.1之前版本和lakeFS-enterprise 1.84.0之前版本存在跨站脚本漏洞，该漏洞源于lakeFS Web UI渲染markdown文件时未对生成的HTML进行清理，可能导致具有写权限的用户提交包含任意HTML/JavaScript的.md对象，其他用户打开该对象或导航到包含恶意README.md的仓库或目录时执行脚本。

CVSS 8.7 · High EPSS 0.37% · P28

Affected Version Matrix 2

VendorProduct Version RangeStatus
treeverse lakeFS < 1.81.1 affected
treeverse lakeFS-enterprise < 1.84.0 affected
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I. Basic Information for CVE-2026-48026

Vulnerability Information
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Vulnerability Title
lakeFS vulnerable to stored XSS in rendered markdown previews via raw HTML
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Treeverse lakefs 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Treeverse lakeFS是Treeverse公司开源的一个提供数据湖版本控制能力的平台。 Treeverse lakefs 1.81.1之前版本和lakeFS-enterprise 1.84.0之前版本存在跨站脚本漏洞，该漏洞源于lakeFS Web UI渲染markdown文件时未对生成的HTML进行清理，可能导致具有写权限的用户提交包含任意HTML/JavaScript的.md对象，其他用户打开该对象或导航到包含恶意README.md的仓库或目录时执行脚本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
treeverse lakeFS < 1.81.1 -
treeverse lakeFS-enterprise < 1.84.0 -

II. Public POCs for CVE-2026-48026

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7389 chars
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III. Intelligence Information for CVE-2026-48026

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Patches & Fixes for CVE-2026-48026 (1)

Vendor Advisories for CVE-2026-48026 (1)

IV. Related Vulnerabilities

Same product: lakeFS
Same vendor: treeverse
Same weakness: CWE-79

V. Comments for CVE-2026-48026

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