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CVE-2026-29056— Kanboard's privilege escalation via mass assignment in user invite registration allows any invited user to become admin

Quick assessment

Affected
kanboard kanboard
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.

Kanboard是Kanboard开源的一套开源的可视化任务板软件。该软件能够根据业务定制面板。 Kanboard 1.2.51之前版本存在安全漏洞，该漏洞源于用户邀请注册端点未过滤role字段，可能导致攻击者注入role=app-admin参数创建管理员账户。

AI Predicted 9.8 Difficulty: Trivial EPSS 0.56% · P44

Possible ATT&CK Techniques 1 AI

T1136.003 · Cloud Account
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I. Basic Information for CVE-2026-29056

Vulnerability Information
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Vulnerability Title
Kanboard's privilege escalation via mass assignment in user invite registration allows any invited user to become admin
Source: CVE Program / CVE List V5
Vulnerability Description
Kanboard is project management software focused on Kanban methodology. Prior to 1.2.51, Kanboard's user invite registration endpoint (`UserInviteController::register()`) accepts all POST parameters and passes them to `UserModel::create()` without filtering out the `role` field. An attacker who receives an invite link can inject `role=app-admin` in the registration form to create an administrator account. Version 1.2.51 fixes the issue.
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:H/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-915
Source: CVE Program / CVE List V5
Vulnerability Title
Kanboard 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kanboard是Kanboard开源的一套开源的可视化任务板软件。该软件能够根据业务定制面板。 Kanboard 1.2.51之前版本存在安全漏洞，该漏洞源于用户邀请注册端点未过滤role字段，可能导致攻击者注入role=app-admin参数创建管理员账户。
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
kanboard kanboard < 1.2.51 -

II. Public POCs for CVE-2026-29056

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III. Intelligence Information for CVE-2026-29056

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Vendor Advisories for CVE-2026-29056 (1)

IV. Related Vulnerabilities

Same product: kanboard
Same vendor: kanboard
Same weakness: CWE-915

V. Comments for CVE-2026-29056

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