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CVE-2026-111918— Vikunja 1.0.0-rc0 before 2.7.0 Cross-Tenant Task Position Writes via Saved Filter Creation

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 从 1.0.0-rc0 到 2.7.0 之前的版本中， 函数存在授权不当漏洞。该漏洞允许已认证但无任何可访问项目的用户，在实例范围内为所有任务写入 行。攻击者可在重新指向 后删除自己的收件箱，随后创建带有空过滤条件的已保存过滤器，以持久化跨租户引用并放大写操作，从而引发拒绝服务（DoS）攻击。

CVSS 5.4 · Medium EPSS 0.18% · P7

Affected Version Matrix 2

VendorProduct Version RangeStatus
go-vikunja vikunja 1.0.0-rc0< 2.7.0 affected
2.7.0 unaffected
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I. Basic Information for CVE-2026-111918

Vulnerability Information
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Vulnerability Title
Vikunja 1.0.0-rc0 before 2.7.0 Cross-Tenant Task Position Writes via Saved Filter Creation
Source: CVE Program / CVE List V5
Vulnerability Description
Vikunja from 1.0.0-rc0 before 2.7.0 contains an improper authorization vulnerability in RecalculateTaskPositions that allows authenticated users with zero accessible projects to write task_positions rows for all tasks instance-wide. Attackers can delete their Inbox after repointing default_project_id, then create empty-filter saved filters to persist cross-tenant references and amplify writes for denial of service.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
go-vikunja vikunja 1.0.0-rc0 ~ 2.7.0 -

II. Public POCs for CVE-2026-111918

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III. Intelligence Information for CVE-2026-111918

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Vendor Advisories for CVE-2026-111918 (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-2026-111920 4.3 MEDIUM Vikunja 2.6.0 Broken Access Control via Inherited Project Permissions

IV. Related Vulnerabilities

Same product: vikunja
Same vendor: go-vikunja
Same weakness: CWE-863

V. Comments for CVE-2026-111918

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