go-vikunja up to 2.2.0 Attachments ReadOne authorization

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.84

Summaryinfo

A vulnerability identified as critical has been detected in go-vikunja vikunja up to 2.2.0. The affected element is the function ReadOne of the component Attachments Handler. Performing a manipulation results in authorization. This vulnerability is cataloged as CVE-2026-33678. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in go-vikunja vikunja up to 2.2.0. This affects the function ReadOne of the component Attachments Handler. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, `TaskAttachment.ReadOne()` queries attachments by ID only (`WHERE id = ?`), ignoring the task ID from the URL path. The permission check in `CanRead()` validates access to the task specified in the URL, but `ReadOne()` loads a different attachment that may belong to a task in another project. This allows any authenticated user to download or delete any attachment in the system by providing their own accessible task ID with a target attachment ID. Attachment IDs are sequential integers, making enumeration trivial. Version 2.2.1 patches the issue.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-33678 since 03/23/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available.

Upgrading to version 2.2.1 eliminates this vulnerability. The upgrade is hosted for download at vikunja.io.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.2
VulDB Meta Temp Score: 7.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.1
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authorization
CWE: CWE-639 / CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: vikunja 2.2.1

Timelineinfo

03/23/2026 CVE reserved
03/24/2026 +1 days Advisory disclosed
03/24/2026 +0 days VulDB entry created
03/29/2026 +5 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-jfmm-mjcp-8wq2
Status: Confirmed

CVE: CVE-2026-33678 (🔒)
GCVE (CVE): GCVE-0-2026-33678
GCVE (VulDB): GCVE-100-352809

Entryinfo

Created: 03/24/2026 17:31
Updated: 03/29/2026 03:20
Changes: 03/24/2026 17:31 (66), 03/29/2026 03:20 (1)
Complete: 🔍
Cache ID: 216:093:103

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