go-vikunja up to 1.x ZIP restore.go restoreConfig path traversal

Summaryinfo

A vulnerability, which was classified as critical, was found in go-vikunja vikunja up to 1.x. This issue affects the function restoreConfig of the file vikunja/pkg/modules/dump/restore.go of the component ZIP Handler. Such manipulation leads to path traversal. This vulnerability is documented as CVE-2026-27819. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in go-vikunja vikunja up to 1.x and classified as critical. Affected by this issue is the function restoreConfig of the file vikunja/pkg/modules/dump/restore.go of the component ZIP Handler. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Vikunja is an open-source self-hosted task management platform. Prior to version 2.0.0, the restoreConfig function in vikunja/pkg/modules/dump/restore.go of the go-vikunja/vikunja repository fails to sanitize file paths within the provided ZIP archive. A maliciously crafted ZIP can bypass the intended extraction directory to overwrite arbitrary files on the host system. Additionally, we’ve discovered that a malformed archive triggers a runtime panic, crashing the process immediately after the database has been wiped permanently. The application trusts the metadata in the ZIP archive. It uses the Name attribute of the zip.File struct directly in os.OpenFile calls without validation, allowing files to be written outside the intended directory. The restoration logic assumes a specific directory structure within the ZIP. When provided with a "minimalist" malicious ZIP, the application fails to validate the length of slices derived from the archive contents. Specifically, at line 154, the code attempts to access an index of len(ms)-2 on an insufficiently populated slice, triggering a panic. Version 2.0.0 fixes the issue.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-27819 since 02/24/2026. The exploitation is known to be easy. The attack may be launched remotely. The exploitation needs additional levels of successful authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 2.0.0 eliminates this vulnerability. The upgrade is hosted for download at vikunja.io.

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Productinfo

Vendor

• go-vikunja

Name

• vikunja

Version

• 1.x

Website

• Product: https://github.com/go-vikunja/vikunja/

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