What’s Vulnerable › Vulnerabilities

CVE-2026-33680: Vikunja Vulnerable to Link Share Hash Disclosure via ReadAll Endpoint Enables Permission Escalation

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-24 · updated 2026-06-17
• Weakness: CWE-285

Description

Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.2, the `LinkSharing.ReadAll()` method allows link share authenticated users to list all link shares for a project, including their secret hashes. While `LinkSharing.CanRead()` correctly blocks link share users from reading individual shares via `ReadOne`, the `ReadAllWeb` handler bypasses this check by never calling `CanRead()`. An attacker with a read-only link share can retrieve hashes for write or admin link shares on the same project and authenticate with them, escalating to full admin access. Version 2.2.2 patches the issue.

Affected products

• go-vikunja vikunja: before 2.2.2 — fixed in 2.2.2

How to fix

Upgrade to a fixed version: go-vikunja vikunja 2.2.2. Check the vendor advisory for mitigations.

References

• https://github.com/go-vikunja/vikunja/commit/9efe1fadba817923c7c7f5953c3e9e9c5683bbf3
• https://github.com/go-vikunja/vikunja/security/advisories/GHSA-8hp8-9fhr-pfm9
• https://vikunja.io/changelog/vikunja-v2.2.2-was-released

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