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

> Attackers with write access can inject malicious scripts into markdown files, executing them in other users' sessions to steal data or take over accounts.

- **Severity:** High 8.7 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 7 Aug 2026
- **Updated:** 12 Aug 2026
- **Also known as:** GHSA-c2r5-5j4w-2xff

## What is CVE-2026-48026?

CVE-2026-48026 is a high-severity cross-site scripting vulnerability in treeverse lakeFS, published on 7 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-48026?


## How do I fix CVE-2026-48026?

No fix has been published for CVE-2026-48026 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-48026 being exploited?

There is no known exploitation of CVE-2026-48026 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-48026 and fix it if it is affected.

What it is: CVE-2026-48026 is a high-severity cross-site scripting vulnerability in treeverse lakeFS, published on 7 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-48026 in the wild and no public exploit code.

Affected product: treeverse lakeFS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-48026/ (Markdown: https://insights.sbomify.com/CVE-2026-48026/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-48026
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-48026
- OSV: https://osv.dev/vulnerability/CVE-2026-48026

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-48026/
Summaries are generated and may contain mistakes; the official description above is the record.