Authorization Weakness in WeKan's Attachment Upload API
CVE-2026-25561

7.1HIGH

Key Information:

Vendor

Wekan

Status
Wekan
Vendor
CVE Published:
7 February 2026

What is CVE-2026-25561?

WeKan versions prior to 8.19 exhibit a significant flaw in their attachment upload API, allowing malicious entities to upload files with incorrect identifiers. This authorization weakness arises from insufficient validation of identifiers such as boardId, cardId, swimlaneId, and listId. As a result, attackers may leverage this loophole to create attachments that do not correlate with the intended objects, potentially compromising data integrity and security within the WeKan platform.

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Deploy the Patch

Affected Version(s)

WeKan 0 < 8.19

References

https://github.com/wekan/wekan/commit/1d16955b6d4f0a0282e...
patch
https://wekan.fi/
product
https://www.vulncheck.com/advisories/wekan-attachment-upl...
third-party-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Joshua Rogers
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