7.2

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-27819

CVE-2026-27819: Vikunja has Path Traversal in CLI Restore

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.

(GitHub Advisory)

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CVE-2026-27819

CVE-2026-27819:

7.2

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
code.vikunja.io/api	go	<= 0.24.6

Technical Details

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Miggo AI

Root Cause Analysis

The vulnerability description and stack trace point to the Restore function in pkg/modules/dump/restore.go as the source of a path traversal and a denial-of-service vulnerability. The provided commit 1b3d8dc59cb5f2b759ab0ad2bc9915b993e3cb73, referenced in the security advisory, contains a patch for this file. The patch modifies the Restore function to add sanitization for file paths extracted from the backup archive. Specifically, it introduces a new function, parseDbFileName, to validate and clean the filenames for database table dumps, preventing path traversal attacks. The vulnerable code directly used parts of the filename from the zip archive to construct file paths. The Restore function is also where the index-out-of-bounds panic occurs, as described in the vulnerability details. Although the description mentions a restoreConfig function, it does not exist in the codebase; the logic for handling configuration is contained within the Restore function. Therefore, Restore is the primary vulnerable function.

Vulnerable functions

code.vikunja.io/api/pkg/modules/dump.Restore

pkg/modules/dump/restore.go

The `Restore` function is vulnerable to path traversal (Zip Slip). It processes a zip archive for restoration and uses file paths from the archive without proper sanitization. An attacker can craft a zip file with file paths containing `../` sequences to write files outside of the intended destination directory. The provided patch introduces the `parseDbFileName` function, which validates and sanitizes the table name extracted from the zip file, preventing directory traversal. The function was also vulnerable to a denial-of-service attack caused by an index out-of-range panic when processing a malformed archive, which occurs after the database has been wiped.

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WAF Rule

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Reasoning

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