Is CVE-2026-33678 actively exploited?

No active exploitation of CVE-2026-33678 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33678 be exploited remotely?

Yes. CVE-2026-33678 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33678?

CVE-2026-33678 has a CVSS score of 8.1 (HIGH).

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HIGH

CVE-2026-33678

CWE-639Published: March 24, 2026· Updated: Mar 30, 2026

8.1

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.9th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-33678 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 8.1.