Docmost 0.21.0 Avatar Attachments attachment.controller.ts path traversal

Summaryinfo

A vulnerability was found in Docmost 0.21.0. It has been rated as critical. This affects an unknown part of the file apps/server/src/core/attachment/attachment.controller.ts of the component Avatar Attachments. This manipulation causes path traversal. This vulnerability appears as CVE-2025-57231. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as critical was found in Docmost 0.21.0. Affected by this vulnerability is an unknown function of the file apps/server/src/core/attachment/attachment.controller.ts of the component Avatar Attachments. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Path Traversal in avatar attachments in Docmost v0.21.0 allows an unauthenticated malicious actor to disclose local files via a POST Request in a public url.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-57231 since 08/17/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/11/2026). The attack technique deployed by this issue is T1006 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.

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Productinfo

Name

• Docmost

Version

• 0.21.0

Website

• Product: https://github.com/docmost/docmost/

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