Vulnerability · Published Mar 24, 2026 · Assigned by GitHub_M

CVE-2026-33676Vikunja has Cross-Project Information Disclosure via Task Relations — Missing Authorization Check on Related Task Read

Medium 6.5

In plain English

A medium-severity incorrect authorization in vikunja from go-vikunja. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 69.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, when the Vikunja API returns tasks, it populates the `related_tasks` field with full task objects for all related tasks without checking whether the requesting user has read permission on those tasks' projects. An authenticated user who can read a task that has cross-project relations will receive full details (title, description, due dates, priority, percent completion, project ID, etc.) of tasks in projects they have no access to. Version 2.2.1 patches the issue.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	code.vikunja.io/api	2.2.1	GHSA-8cmm-j6c4-rr8v
Go	code.vikunja.io/api	no fix listed	GO-2026-4847

Affected products (as reported)

Vendor	Product	Versions
go-vikunja	vikunja	< 2.2.1

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-8cmm-j6c4-rr8v x_refsource_CONFIRM
https://github.com/go-vikunja/vikunja/pull/2449 x_refsource_MISC
https://github.com/go-vikunja/vikunja/commit/833f2aec006ac0f6643c41872e45dd79220b9174 x_refsource_MISC
https://vikunja.io/changelog/vikunja-v2.2.2-was-released x_refsource_MISC