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CVE-2026-55066— Vikunja: Cross-tenant IDOR in kanban move-task endpoint via unauthorized body task_id

Quick assessment

Affected
go-vikunja vikunja
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.

go-vikunja Vikunja是go-vikunja组织的一款任务管理服务器软件。 go-vikunja Vikunja 2.4.0之前版本存在授权问题漏洞，该漏洞源于POST接口对task_id参数权限检查不足，导致经过身份验证的用户可以枚举跨租户任务并修改其完成元数据。

CVSS 7.1 · High EPSS 0.37% · P30

Affected Version Matrix 1

VendorProduct Version RangeStatus
go-vikunja vikunja < 2.4.0 affected
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I. Basic Information for CVE-2026-55066

Vulnerability Information
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Vulnerability Title
Vikunja: Cross-tenant IDOR in kanban move-task endpoint via unauthorized body task_id
Source: CVE Program / CVE List V5
Vulnerability Description
Vikunja is an open-source self-hosted task management platform. Prior to 2.4.0, POST /api/v1/projects/{project}/views/{view}/buckets/{bucket}/tasks accepts a body supplied task_id but TaskBucket.CanUpdate in pkg/models/kanban_task_bucket.go authorizes only the project, view, and bucket from the URL. updateTaskBucket then calls Task.ReadOne without a separate task permission check, returns the victim task contents, and can update the task done state when the attacker chooses a done bucket. Because task identifiers are global sequential values, an authenticated user can enumerate cross-tenant tasks and modify their completion metadata through both the v1 and v2 routes that share this model. This issue is fixed in version 2.4.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
go-vikunja Vikunja 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
go-vikunja Vikunja是go-vikunja组织的一款任务管理服务器软件。 go-vikunja Vikunja 2.4.0之前版本存在授权问题漏洞，该漏洞源于POST接口对task_id参数权限检查不足，导致经过身份验证的用户可以枚举跨租户任务并修改其完成元数据。
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
go-vikunja vikunja < 2.4.0 -

II. Public POCs for CVE-2026-55066

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III. Intelligence Information for CVE-2026-55066

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Patches & Fixes for CVE-2026-55066 (2)

Vendor Pages for CVE-2026-55066 (1)

Same Patch Batch · go-vikunja · 2026-08-28 · 5 CVEs total

CVE-2026-55065 8.1 HIGH Vikunja: Improper Authorization and Authorization Bypass Through User-Controlled Key in co
CVE-2026-54766 5.3 MEDIUM Vikunja: Project duplication bypasses write-permission check on the target parent project
CVE-2026-55067 5.0 MEDIUM Vikunja: Authenticated cross-tenant kanban-bucket relocation via `project_view_id` mass-as
CVE-2026-55064 4.3 MEDIUM Vikunja incomplete fix for CVE-2026-35595: Write-only user can detach shared project from

IV. Related Vulnerabilities

Same product: vikunja
Same vendor: go-vikunja
Same weakness: CWE-639