How severe is CVE-2026-34727?

CVE-2026-34727 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-34727 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34727?

CVE-2026-34727 affects Vikunja. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34727?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-34727 have an EU (EUVD) identifier?

Yes. CVE-2026-34727 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21414.

When was CVE-2026-34727 published?

CVE-2026-34727 was published on 2026-04-10 and last updated on 2026-06-17.

CVE-2026-34727

CVE-2026-34727 is a high-severity vulnerability in Vikunja with a CVSS 3.x base score of 7.4. 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-287.

Key facts

Severity: High (CVSS 3.x base score 7.4)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21414
Weakness: CWE-287
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 OIDC callback handler issues a full JWT token without checking whether the matched user has TOTP two-factor authentication enabled. When a local user with TOTP enrolled is matched via the OIDC email fallback mechanism, the second factor is completely skipped. This vulnerability is fixed in 2.3.0.

Frequently asked questions

What is CVE-2026-34727?: Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the OIDC callback handler issues a full JWT token without checking whether the matched user has TOTP two-factor authentication enabled. When a local user with TOTP enrolled is matched via the OIDC email fallback mechanism, the second factor is completely skipped. This vulnerability is fixed in 2.3.0.
How severe is CVE-2026-34727?: CVE-2026-34727 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-34727 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34727?: CVE-2026-34727 affects Vikunja. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34727?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-34727 have an EU (EUVD) identifier?: Yes. CVE-2026-34727 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21414.
When was CVE-2026-34727 published?: CVE-2026-34727 was published on 2026-04-10 and last updated on 2026-06-17.

References

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-8jvc-mcx6-r4cg

Affected products (1)

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

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