Read-only Vikunja users can delete project background images via broken object-level authorization
Priority MEDIUM 57CWE-863Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00224 13th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed vikunja (go-vikunja): 2.2.0code.vikunja.io/api (Go): 2.2.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| go-vikunja | vikunja | 0.20.2 to before 2.2.0 | 2.2.0 | Patch available | CNA |
| — | code.vikunja.io/api (Go) | 0.20.2 to before 2.2.0 | 2.2.0 | Patch available | GHSA-564f-wx8x-878h |
- vikunja Vendorgo-vikunja Affected 0.20.2 to before 2.2.0 Fixed in 2.2.0 Patch available CNA
- code.vikunja.io/api (Go) Vendor— Affected 0.20.2 to before 2.2.0 Fixed in 2.2.0 Patch available GHSA-564f-wx8x-878h
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:* | 0.20.2 to before 2.2.0 | Vulnerable | go-vikunja |
- cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:* Versions 0.20.2 to before 2.2.0 Vulnerable ·go-vikunja
Remediation
- Fix · CNA vikunja (go-vikunja) Fixed in 2.2.0
- Fix · GHSA-564f-wx8x-878h code.vikunja.io/api (Go) Fixed in 2.2.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-33312
- 2026-10-03 Alias added: GHSA-564f-wx8x-878h
References
More go-vikunja Vikunja vulnerabilities
- TI-2026-21967 Vijkunja has Weak Password Policy Combined with Persistent Sessions After Password Change CVSS 3.1CRITICAL 9.1
- TI-2026-26971 Vikunja ahs a TOTP Two-Factor Authentication Bypass via OIDC Login Path CVSS 3.1CRITICAL 9.1
- TI-2026-26060 Vikunja Vulnerable to Link Share Hash Disclosure via ReadAll Endpoint Enables Permission Escalation CVSS 3.1HIGH 7.5
- TI-2026-20965 Vikunja Affected by XSS Via Task Preview CVSS 4.0HIGH 8.6
- TI-2026-27698 Vikunja Affected by Privilege Escalation via Project Reparenting CVSS 3.1HIGH 8.3
- TI-2026-25727 Vikunja’s Improper Access Control Enables Bypass of Administrator-Imposed Account Disablement CVSS 3.1HIGH 8.1
Sources
- CVE-2026-33312 · CVE Program
- CVE-2026-33312 · NVD
- FIRST EPSS
- GHSA-564f-wx8x-878h · GitHub Advisory Database · CC BY 4.0
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