Is CVE-2026-35598 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-35598, but active exploitation has not been confirmed.

Can CVE-2026-35598 be exploited remotely?

Yes. CVE-2026-35598 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-35598?

CVE-2026-35598 has a CVSS score of 4.3 (MEDIUM).

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MEDIUMPOC

CVE-2026-35598

CWE-862Published: April 10, 2026· Updated: Apr 14, 2026

4.3

CVSS v3.1

Official Description

Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV GetResource and GetResourcesByList methods fetch tasks by UID from the database without verifying that the authenticated user has access to the task's project. Any authenticated CalDAV user who knows (or guesses) a task UID can read the full task data from any project on the instance. This vulnerability is fixed in 2.3.0.

NVD Source

Technical Analysis

CVE-2026-35598 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A proof-of-concept (PoC) exploit exists for CVE-2026-35598. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.