How severe is CVE-2026-35598?

CVE-2026-35598 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-35598 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35598?

CVE-2026-35598 affects Vikunja. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35598?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-35598 have an EU (EUVD) identifier?

Yes. CVE-2026-35598 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21425.

When was CVE-2026-35598 published?

CVE-2026-35598 was published on 2026-04-10 and last updated on 2026-06-17.

CVE-2026-35598

CVE-2026-35598 is a medium-severity vulnerability in Vikunja with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21425
Weakness: CWE-862
Affected product: Vikunja
Published: 2026-04-10
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-35598?: 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.
How severe is CVE-2026-35598?: CVE-2026-35598 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-35598 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35598?: CVE-2026-35598 affects Vikunja. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35598?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-35598 have an EU (EUVD) identifier?: Yes. CVE-2026-35598 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21425.
When was CVE-2026-35598 published?: CVE-2026-35598 was published on 2026-04-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*

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