# CVE-2026-80426: FiftyOne before 1.21.0 Stored Cross-Site Scripting via Unescaped Field Description

> Attackers can inject scripts via dataset field descriptions, leading to code execution and local file access in FiftyOne.

- **Severity:** High 7.0 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 26 Aug 2026
- **Updated:** 29 Aug 2026
- **Also known as:** GHSA-q8rv-hw8g-gww7

## What is CVE-2026-80426?

CVE-2026-80426 is a high-severity cross-site scripting vulnerability in voxel51 fiftyone, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

FiftyOne renders a dataset field's description as markup. The sidebar field-information component at app/packages/core/src/components/FieldLabelAndInfo/index.tsx passes the description string to React's dangerouslySetInnerHTML, and no layer between storage and render escapes or sanitises it; the neighbouring info values in the same component are rendered as React children and are escaped, so the description is the only raw path. A description is free-form text held in the dataset schema, so it persists in the database and travels with an exported or published dataset. Opening a dataset obtained from another party and hovering the field runs the stored markup in the application's origin. That origin is shared with the FiftyOne server, whose media route returns the contents of a caller-named absolute path and which is unauthenticated in the open-source server, so the injected script can read local files and reach the dataset and operator endpoints as the viewing user.

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

## Which versions are affected by CVE-2026-80426?


## How do I fix CVE-2026-80426?

No fix has been published for CVE-2026-80426 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-80426 being exploited?

There is no known exploitation of CVE-2026-80426 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-80426 and fix it if it is affected.

What it is: CVE-2026-80426 is a high-severity cross-site scripting vulnerability in voxel51 fiftyone, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-80426 in the wild and no public exploit code.

Affected product: voxel51 fiftyone. 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-2026-80426/ (Markdown: https://insights.sbomify.com/CVE-2026-80426/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-80426
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-80426
- OSV: https://osv.dev/vulnerability/CVE-2026-80426

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-80426/
Summaries are generated and may contain mistakes; the official description above is the record.