How severe is CVE-2026-28268?

CVE-2026-28268 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-28268 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-28268?

CVE-2026-28268 affects Vikunja. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-28268?

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

Does CVE-2026-28268 have an EU (EUVD) identifier?

Yes. CVE-2026-28268 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9064.

When was CVE-2026-28268 published?

CVE-2026-28268 was published on 2026-02-27 and last updated on 2026-06-17.

CVE-2026-28268

CVE-2026-28268 is a critical-severity vulnerability in Vikunja with a CVSS 3.x base score of 9.8. 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-640.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9064
Weakness: CWE-640
Affected product: Vikunja
Published: 2026-02-27
Last modified: 2026-06-17

Description

Vikunja is an open-source self-hosted task management platform. Versions prior to 2.1.0 have a business logic vulnerability exists in the password reset mechanism of vikunja/api that allows password reset tokens to be reused indefinitely. Due to a failure to invalidate tokens upon use and a critical logic bug in the token cleanup cron job, reset tokens remain valid forever. This allows an attacker who intercepts a single reset token (via logs, browser history, or phishing) to perform a complete, persistent account takeover at any point in the future, bypassing standard authentication controls. Version 2.1.0 contains a patch for the issue.

Frequently asked questions

What is CVE-2026-28268?: Vikunja is an open-source self-hosted task management platform. Versions prior to 2.1.0 have a business logic vulnerability exists in the password reset mechanism of vikunja/api that allows password reset tokens to be reused indefinitely. Due to a failure to invalidate tokens upon use and a critical logic bug in the token cleanup cron job, reset tokens remain valid forever. This allows an attacker who intercepts a single reset token (via logs, browser history, or phishing) to perform a complete, persistent account takeover at any point in the future, bypassing standard authentication controls. Version 2.1.0 contains a patch for the issue.
How severe is CVE-2026-28268?: CVE-2026-28268 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-28268 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-28268?: CVE-2026-28268 affects Vikunja. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-28268?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-28268 have an EU (EUVD) identifier?: Yes. CVE-2026-28268 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9064.
When was CVE-2026-28268 published?: CVE-2026-28268 was published on 2026-02-27 and last updated on 2026-06-17.

References

Affected products (1)

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

More vulnerabilities in Vikunja

CVE-2026-33334 — Critical (CVSS 9.6): Vikunja is an open-source self-hosted task management platform. Starting in version 0.21.0 and prior to version 2.2.0,…
CVE-2026-27575 — Critical (CVSS 9.1): Vikunja is an open-source self-hosted task management platform. Prior to version 2.0.0, the application allows users to…
CVE-2026-33336 — High (CVSS 8.8): Vikunja is an open-source self-hosted task management platform. Starting in version 0.21.0 and prior to version 2.2.0,…
CVE-2026-35595 — High (CVSS 8.3): Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CanUpdate check at…
CVE-2026-33678 — High (CVSS 8.1): Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, `TaskAttachment.ReadOne()`…
CVE-2026-33668 — High (CVSS 8.1): Vikunja is an open-source self-hosted task management platform. Starting in version 0.18.0 and prior to version 2.2.1,…

All CVEs affecting Vikunja →

Other CWE-640 vulnerabilities

CVE-2025-63314 — Critical (CVSS 10.0): A static password reset token in the password reset function of DDSN Interactive Acora CMS v10.7.1 allows attackers to…
CVE-2023-7028 — Critical (CVSS 10.0): An issue has been discovered in GitLab CE/EE affecting all versions from 16.1 prior to 16.1.6, 16.2 prior to 16.2.9,…
CVE-2026-13019 — Critical (CVSS 9.8): Esri Portal for ArcGIS versions 12.1 and earlier on Windows, Linux and Kubernetes have a missing authentication for…
CVE-2026-37106 — Critical (CVSS 9.8): An issue in DokuWiki 2025-05-14b "Librarian" 56.2 allows a remote attacker to create an account via the register…
CVE-2026-12417 — Critical (CVSS 9.8): The SignUp & SignIn plugin for WordPress is vulnerable to Authentication Bypass via Weak Password Reset Validation…
CVE-2026-12416 — Critical (CVSS 9.8): The Invoice Generator plugin for WordPress is vulnerable to Account Takeover via Password Reset in all versions up to,…

Browse all CWE-640 vulnerabilities →