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CVE-2026-25561— WeKan < 8.19 Attachment Upload Object Relationship Validation Bypass

Quick assessment

Affected
WeKan WeKan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WeKan是WeKan开源的一个看板应用程序。 WeKan 8.19之前版本存在安全漏洞，该漏洞源于附件上传API未充分验证提供的标识符一致性和关联性，可能导致尝试上传具有不匹配对象关系的附件。

AI Predicted 7.5 Difficulty: Easy EPSS 0.32% · P25

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
WeKan WeKan < 8.19 affected
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I. Basic Information for CVE-2026-25561

Vulnerability Information
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Vulnerability Title
WeKan < 8.19 Attachment Upload Object Relationship Validation Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
WeKan versions prior to 8.19 contain an authorization weakness in the attachment upload API. The API does not fully validate that provided identifiers (such as boardId, cardId, swimlaneId, and listId) are consistent and refer to a coherent card/board relationship, enabling attempts to upload attachments with mismatched object relationships.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
WeKan 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WeKan是WeKan开源的一个看板应用程序。 WeKan 8.19之前版本存在安全漏洞，该漏洞源于附件上传API未充分验证提供的标识符一致性和关联性，可能导致尝试上传具有不匹配对象关系的附件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
WeKan WeKan 0 ~ 8.19 -

II. Public POCs for CVE-2026-25561

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-25561

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Patches & Fixes for CVE-2026-25561 (1)

Same Patch Batch · WeKan · 2026-02-07 · 10 CVEs total

CVE-2026-25567 WeKan < 8.19 Card Comment Author Spoofing via User-controlled authorId
CVE-2026-25565 WeKan < 8.19 Read-only Board Roles Can Update Cards
CVE-2026-25568 WeKan < 8.19 allowPrivateOnly Setting Enforcement Bypass
CVE-2026-25564 WeKan < 8.19 Checklist Deletion IDOR via Missing Relationship Validation
CVE-2026-25562 WeKan < 8.19 Attachments Publication Information Disclosure
CVE-2026-25560 WeKan < 8.19 LDAP Authentication Filter Injection
CVE-2026-25563 WeKan < 8.19 Checklist Creation Cross-Board IDOR
CVE-2026-25566 WeKan < 8.19 Cross-board Card Move Without Destination Authorization
CVE-2026-25859 WeKan < 8.20 Migration Functionality Insufficient Permission Checks

IV. Related Vulnerabilities

Same product: WeKan
Same vendor: WeKan
Same weakness: CWE-863