twentyhq twenty up to 1.18.0 File Serving Endpoint /files/ cross site scripting

Summaryinfo

A vulnerability classified as problematic has been found in twentyhq twenty up to 1.18.0. Affected by this issue is some unknown functionality of the file /files/ of the component File Serving Endpoint. This manipulation causes cross site scripting. This vulnerability is tracked as CVE-2026-44729. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as problematic was found in twentyhq twenty up to 1.18.0. Affected by this vulnerability is some unknown processing of the file /files/ of the component File Serving Endpoint. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-44729 since 05/07/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-31895). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• twentyhq

Name

• twenty

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18.0

Website

• Product: https://github.com/twentyhq/twenty/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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