Wekan up to 9.30 Attachments attachments.js getReadStream versions.original.path/versions.original.storage path traversal

Summaryinfo

A vulnerability marked as critical has been reported in Wekan up to 9.30. This affects the function getReadStream of the file server/permissions/attachments.js of the component Attachments. Performing a manipulation of the argument versions.original.path/versions.original.storage results in path traversal. This vulnerability is known as CVE-2026-52890. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, was found in Wekan up to 9.30. This affects the function getReadStream of the file server/permissions/attachments.js of the component Attachments. The manipulation of the argument versions.original.path/versions.original.storage with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Wekan is open source kanban built with Meteor. Prior to 9.31, Wekan allows a logged-in board member to insert an attachment document through the /attachments/insert DDP method with attacker-controlled versions.original.path and versions.original.storage fields. The server/permissions/attachments.js insert rule checks only board write access, and FileStoreStrategyFilesystem.getReadStream() in models/lib/fileStoreStrategy.js streams the stored path without a storage-root containment check, allowing arbitrary file reads and denial of service through special files such as /dev/zero. This issue is fixed in version 9.31.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-52890 since 06/08/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 9.31 eliminates this vulnerability.

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Productinfo

Name

• Wekan

Version

• 9.0
• 9.1
• 9.2
• 9.3
• 9.4
• 9.5
• 9.6
• 9.7
• 9.8
• 9.9
• 9.10
• 9.11
• 9.12
• 9.13
• 9.14
• 9.15
• 9.16
• 9.17
• 9.18
• 9.19
• 9.20
• 9.21
• 9.22
• 9.23
• 9.24
• 9.25
• 9.26
• 9.27
• 9.28
• 9.29
• 9.30

Website

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

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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