How severe is CVE-2026-35594?

CVE-2026-35594 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-35594 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35594?

CVE-2026-35594 affects Vikunja. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35594?

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

Does CVE-2026-35594 have an EU (EUVD) identifier?

Yes. CVE-2026-35594 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21417.

When was CVE-2026-35594 published?

CVE-2026-35594 was published on 2026-04-10 and last updated on 2026-06-17.

CVE-2026-35594

CVE-2026-35594 is a medium-severity vulnerability in Vikunja with a CVSS 3.x base score of 6.5. 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-613.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21417
Weakness: CWE-613
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, Vikunja's link share authentication (GetLinkShareFromClaims in pkg/models/link_sharing.go) constructs authorization objects entirely from JWT claims without any server-side database validation. When a project owner deletes a link share or downgrades its permissions, all previously issued JWTs continue to grant the original permission level for up to 72 hours (the default service.jwtttl). This vulnerability is fixed in 2.3.0.

Frequently asked questions

What is CVE-2026-35594?: Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's link share authentication (GetLinkShareFromClaims in pkg/models/link_sharing.go) constructs authorization objects entirely from JWT claims without any server-side database validation. When a project owner deletes a link share or downgrades its permissions, all previously issued JWTs continue to grant the original permission level for up to 72 hours (the default service.jwtttl). This vulnerability is fixed in 2.3.0.
How severe is CVE-2026-35594?: CVE-2026-35594 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-35594 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35594?: CVE-2026-35594 affects Vikunja. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35594?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-35594 have an EU (EUVD) identifier?: Yes. CVE-2026-35594 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21417.
When was CVE-2026-35594 published?: CVE-2026-35594 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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