# CVE-2026-44729: Twenty: Stored Cross-Site Scripting via Unsanitized File Serving (Missing Content-Type/Content-Disposition Headers)

> An authenticated attacker can upload malicious HTML files that execute JavaScript in victims' browsers due to missing security headers, enabling account takeover.

- **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:** 26 May 2026
- **Updated:** 27 May 2026
- **Also known as:** GHSA-f5h2-3qw5-3qp7

## What is CVE-2026-44729?

CVE-2026-44729 is a high-severity cross-site scripting vulnerability in twentyhq twenty, published on 26 May 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

Twenty is an open source CRM. In 1.18.0 and earlier, the file serving endpoints in Twenty CRM at /files/* and /file/:fileFolder/:id serve uploaded files using fileStream.pipe(res) without setting any Content-Type, Content-Disposition, or X-Content-Type-Options response headers. This allows an authenticated attacker to upload an HTML file containing JavaScript, which will be rendered by the victim's browser in the context of the Twenty CRM domain when accessed — enabling session hijacking, account takeover, and data theft.

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

## Which versions are affected by CVE-2026-44729?

It affects 1 product.


Products: Twenty Twenty.

## How do I fix CVE-2026-44729?

No fix has been published for CVE-2026-44729 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-44729 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44729 exists.

## Other vulnerabilities in twentyhq twenty

- [CVE-2026-46624](https://insights.sbomify.com/CVE-2026-46624/): Twenty: SQL Injection via the timeZone field (critical 9.9)
- [CVE-2026-26720](https://insights.sbomify.com/CVE-2026-26720/): Code injection in n/a (critical 9.8)
- [CVE-2024-28434](https://insights.sbomify.com/CVE-2024-28434/): Cross-site scripting in n/a (high 7.6)
- [CVE-2024-28435](https://insights.sbomify.com/CVE-2024-28435/): Server-side request forgery in n/a (medium 5.4)
- [CVE-2026-27023](https://insights.sbomify.com/CVE-2026-27023/): Twenty: SSRF protection bypass via HTTP redirect following in secure HTTP client (medium 5.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-44729 and fix it if it is affected.

What it is: CVE-2026-44729 is a high-severity cross-site scripting vulnerability in twentyhq twenty, published on 26 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44729 exists.

Affected product: twentyhq twenty. 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-2026-44729/ (Markdown: https://insights.sbomify.com/CVE-2026-44729/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-44729
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-44729
- OSV: https://osv.dev/vulnerability/CVE-2026-44729

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-44729/
Summaries are generated and may contain mistakes; the official description above is the record.