CVE-2026-56765

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Source

https://cve.org/CVERecord?id=CVE-2026-56765

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56765.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-56765

Aliases

Published

2026-07-10T13:57:59.648Z

Modified

2026-07-15T01:48:55.283616609Z

Severity

9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

Vikunja - Unauthenticated Instance-Wide Data Breach via Link Share Hash Disclosure Chained with Cross-Project Attachment IDOR

Details

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.

Database specific

{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-639"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56765.json"
}

References

Affected packages

Git / github.com/go-vikunja/vikunja

Affected ranges

Type

GIT

Repo

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

Events

Introduced

Fixed

6d5d3e051f4f9f6d72f5d1d552c2d90910fccb28

Database specific

{
    "source": [
        "AFFECTED_FIELD",
        "DESCRIPTION"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.2.1"
        }
    ]
}

Affected versions

v0.*

v0.1

v0.10

v0.11

v0.12

v0.13

v0.14.0

v0.15.0

v0.16.0

v0.17.0

v0.18.0

v0.18.1

v0.19.0

v0.19.1

v0.19.2

v0.2

v0.20.0

v0.20.1

v0.20.3

v0.20.4

v0.21.0

v0.22.0

v0.22.1

v0.23.0

v0.24.1

v0.3

v0.4

v0.5

v0.6

v0.7

v0.8

v0.9

v1.*

v1.0.0

v1.0.0-rc0

v1.0.0-rc1

v1.0.0-rc2

v1.0.0-rc3

v1.0.0-rc4

v1.1.0

v2.*

v2.0.0

v2.1.0

v2.2.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56765.json"