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CVE-2026-56765 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

Vikunja before 2.2.1 contains an authorization flaw where the LinkSharing.ReadAll endpoint exposes share hashes to users with read access, enabling permission escalation to admin-level shares. The GetTaskAttachment endpoint performs permission checks against user-supplied task IDs but fetches attachments by sequential ID without verifying ownership, allowing attackers to download and delete all file attachments across all projects instance-wide.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CNA: [email protected]CVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-2pv8-4c52-mf8j	CISA-ADP	AdvisoryExploitRemedyVendor
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-2pv8-4c52-mf8j	[email protected]	AdvisoryExploitRemedyVendor
https://www.vulncheck.com/advisories/vikunja-unauthenticated-instance-wide-data-breach-via-link-share-hash-disclosure-chained-with-cross-project-attachment-idor	[email protected]	Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-639	Authorization Bypass Through User-Controlled Key	[email protected]

Affected Products

Product	Versions
Vikunja	<= 2.2.0 (semver)
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: 2.2.1moderate effort

Change History

2 change records found show changes

Date	Action	Recorded By
Jul 10, 2026	CVE Modified	CISA-ADP
Jul 10, 2026	New CVE Received	[email protected]