CVE-2026-35596 Vikunja has Broken Access Control on Label Read via SQL Operator Precedence Bug

What is CVE-2026-35596?

CVE-2026-35596 is a medium-severity missing authorization vulnerability in go-vikunja vikunja, published on 10 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the hasAccessToLabel function contains a SQL operator precedence bug that allows any authenticated user to read any label that has at least one task association, regardless of project access. Label titles, descriptions, colors, and creator information are exposed. This vulnerability is fixed in 2.3.0.

Weakness: CWE-863

Which versions are affected by CVE-2026-35596?

3 open source packages ship an affected version, including code.vikunja.io/api. It affects 1 product.

Products include Vikunja Vikunja.

How do I fix CVE-2026-35596?

Upgrade code.vikunja.io/api to 2.3.0 or later.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-35596 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-35596 exists.

Other vulnerabilities in go-vikunja vikunja

• CVE-2026-28268 Vikunja Vulnerable to Account Takeover via Password Reset Token Reuse Critical 9.8
• CVE-2026-27575 Vijkunja has Weak Password Policy Combined with Persistent Sessions After Password Change Critical 9.1
• CVE-2026-25935 Vikunja Affected by XSS Via Task Preview High 8.6
• CVE-2026-35595 Vikunja Affected by Privilege Escalation via Project Reparenting High 8.3
• CVE-2026-33316 Vikunja’s Improper Access Control Enables Bypass of Administrator-Imposed Account Disablement High 8.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-hj5c-mhh2-g7jq, GO-2026-5428.