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CVE-2026-111920— Vikunja 2.6.0 Broken Access Control via Inherited Project Permissions

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.

Vikunja 2.6.0 存在一个访问控制缺陷，位于 函数中（文件路径： ）。该函数在计算用户对项目的有效权限时，会取项目树中的最高权限，从而静默地覆盖了子项目上显式设定的较低权限共享设置。因此，即使某协作者在父项目中拥有写入权限，而在子项目中仅被授权为只读，该协作者仍能够修改子项目中的任务和内容。

CVSS 4.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
go-vikunja vikunja 2.6.0 affected
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I. Basic Information for CVE-2026-111920

Vulnerability Information
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Vulnerability Title
Vikunja 2.6.0 Broken Access Control via Inherited Project Permissions
Source: CVE Program / CVE List V5
Vulnerability Description
Vikunja 2.6.0 contains a broken access control flaw in getProjectAccessForUser (pkg/models/project_access.go), which resolves a user's effective project permission as the maximum over the project tree, silently overriding explicit lower-permission shares on sub-projects. A collaborator with write access on a parent project but read-only access to a child project can modify the child project's tasks and content.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
go-vikunja vikunja 2.6.0 -

II. Public POCs for CVE-2026-111920

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III. Intelligence Information for CVE-2026-111920

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Vendor Advisories for CVE-2026-111920 (2)

Same Patch Batch · go-vikunja · 2026-10-17 · 6 CVEs total

CVE-2026-111917 6.5 MEDIUM Vikunja 2.3.0 before 2.7.0 WebSocket Authentication Ignores Session Revocation
CVE-2026-111919 6.5 MEDIUM Vikunja 0.22.0 before 2.7.0 Improper Access Revocation via Webhooks
CVE-2026-111922 6.3 MEDIUM Vikunja 2.2.0 before 2.7.0 Permissive CORS Policy Trusting Localhost Origins
CVE-2026-111921 5.4 MEDIUM Vikunja 0.13.0 before 2.7.0 Incorrect Authorization in Link Share Deletion
CVE-2026-111918 5.4 MEDIUM Vikunja 1.0.0-rc0 before 2.7.0 Cross-Tenant Task Position Writes via Saved Filter Creation

IV. Related Vulnerabilities

Same product: vikunja
Same vendor: go-vikunja
Same weakness: CWE-269

V. Comments for CVE-2026-111920

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