Wekan up to 9.89 File Validation models/fileValidation.js detectMimeFromFile Type unrestricted upload

Summaryinfo

A vulnerability has been found in Wekan up to 9.89 and classified as critical. The affected element is the function detectMimeFromFile of the file models/fileValidation.js of the component File Validation. Performing a manipulation of the argument Type results in input validation. This vulnerability was named CVE-2026-68899. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Wekan up to 9.89. It has been classified as critical. This affects the function detectMimeFromFile of the file models/fileValidation.js of the component File Validation. The manipulation of the argument type with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. 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 9.90, isFileValid() in models/fileValidation.js used the Unix file command for content-based MIME detection, but detectMimeFromFile() silently returned undefined when that binary was unavailable and the validation fell back to the attacker-controlled fileObj.type supplied through server/routes/attachmentApi.js. On deployments with WITH_API=true and no file binary, an authenticated board member could label HTML containing JavaScript as image/png, bypass the dangerous MIME check, and store active content under the Wekan origin for execution when another user opened it. Version 9.90 adds looksLikeDangerousMarkup() to inspect file bytes and force dangerous-content scanning when MIME detection is unavailable. This issue is fixed in version 9.90.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-68899 since 07/31/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1608.002 for this issue.

Upgrading to version 9.90 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
• 9.31
• 9.32
• 9.33
• 9.34
• 9.35
• 9.36
• 9.37
• 9.38
• 9.39
• 9.40
• 9.41
• 9.42
• 9.43
• 9.44
• 9.45
• 9.46
• 9.47
• 9.48
• 9.49
• 9.50
• 9.51
• 9.52
• 9.53
• 9.54
• 9.55
• 9.56
• 9.57
• 9.58
• 9.59
• 9.60
• 9.61
• 9.62
• 9.63
• 9.64
• 9.65
• 9.66
• 9.67
• 9.68
• 9.69
• 9.70
• 9.71
• 9.72
• 9.73
• 9.74
• 9.75
• 9.76
• 9.77
• 9.78
• 9.79
• 9.80
• 9.81
• 9.82
• 9.83
• 9.84
• 9.85
• 9.86
• 9.87
• 9.88
• 9.89

Website

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

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