Is CVE-2026-56765 actively exploited?

No active exploitation of CVE-2026-56765 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-56765 be exploited remotely?

Yes. CVE-2026-56765 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-56765?

CVE-2026-56765 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2026-56765

CWE-639Published: July 10, 2026· Updated: Jul 10, 2026

9.8

CVSS v3.1

EPSS:0.35%probability of exploitation in 30 daysPercentile:27.2th

Official 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.

NVD Source

Risk Analysis

This critical vulnerability in Vikunja allows unauthenticated attackers to escalate privileges and access sensitive data due to authorization flaws. Attackers can gain admin-level access to shares and download/delete all file attachments across all projects. With a CVSS score of 9.8, this flaw presents an extreme risk for data breach and unauthorized system control.

No public exploit is currently known for this vulnerability. The attack vector is network-based with low complexity, indicating it is remotely exploitable.

Recommended Action

Upgrade Vikunja to version 2.2.1 or later to fix the authorization flaws. Implement strong access controls and regularly audit permissions for shared resources.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-56765 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.