CVE-2026-33678: Vikunja is an open-source self-hosted task management platform

Q: How do I fix CVE-2026-33678?

vikunja: upgrade to 2.2.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-33678 being exploited?

CVE-2026-33678 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33678 affect?

CVE-2026-33678 affects vikunja. Severity is high (CVSS 8.1). 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()`

Q: How urgent is CVE-2026-33678?

Priority 39/100. High severity; Public exploit reference

Routine

HIGH 8.1UPGRADE

CVE-2026-33678 is a high-severity flaw (CVSS 8.1) affecting vikunja. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 attachm

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-639
Published	2026-03-24
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: vikunja

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-24 16:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

vikunja vikunja UPGRADE

Affected: < 2.2.1

Fixed in: 2.2.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy vikunja || rpm -q vikunja || vikunja --version

2. UPGRADE to 2.2.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade vikunja

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade vikunja

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33678?

vikunja: upgrade to 2.2.1. Exact commands for each OS are on this page.

Is CVE-2026-33678 being exploited?

CVE-2026-33678 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33678 affect?

CVE-2026-33678 affects vikunja. Severity is high (CVSS 8.1). 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()`

How urgent is CVE-2026-33678?

Priority 39/100. High severity; Public exploit reference

Related CVEs

CVE-2026-35597 MEDIUM 5.9 UPGRADE Vikunja is an open-source self-hosted task management platform
CVE-2026-35596 MEDIUM 4.3 UPGRADE Vikunja is an open-source self-hosted task management platform
CVE-2026-35594 MEDIUM 6.5 UPGRADE Vikunja is an open-source self-hosted task management platform
CVE-2026-35595 HIGH 8.3 UPGRADE Vikunja is an open-source self-hosted task management platform
CVE-2026-35599 MEDIUM 6.5 UPGRADE Vikunja is an open-source self-hosted task management platform

References

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