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CVE-2026-33312— Read-only Vikunja users can delete project background images via broken object-level authorization

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是Vikunja开源的一个待办事项应用程序。 Vikunja 0.20.2至2.2.0之前版本存在安全漏洞，该漏洞源于DELETE /api/v1/projects/:project/background端点错误检查CanRead权限而非CanUpdate权限，可能导致具有只读权限的用户永久删除项目背景图片。

AI Predicted 5.3 Difficulty: Easy EPSS 0.31% · P22

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-33312

Vulnerability Information
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Vulnerability Title
Read-only Vikunja users can delete project background images via broken object-level authorization
Source: CVE Program / CVE List V5
Vulnerability Description
Vikunja is an open-source self-hosted task management platform. Starting in version 0.20.2 and prior to version 2.2.0, the `DELETE /api/v1/projects/:project/background` endpoint checks `CanRead` permission instead of `CanUpdate`, allowing any user with read-only access to a project to permanently delete its background image. Version 2.2.0 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:L/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
Vikunja 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vikunja是Vikunja开源的一个待办事项应用程序。 Vikunja 0.20.2至2.2.0之前版本存在安全漏洞，该漏洞源于DELETE /api/v1/projects/:project/background端点错误检查CanRead权限而非CanUpdate权限，可能导致具有只读权限的用户永久删除项目背景图片。
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 >= 0.20.2, < 2.2.0 -

II. Public POCs for CVE-2026-33312

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III. Intelligence Information for CVE-2026-33312

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Vendor Advisories for CVE-2026-33312 (1)

Vendor Pages for CVE-2026-33312 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-33312

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