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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.18.0,2.2.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "vikunja", "source": "cna", "vendor": "go-vikunja"}, "product": "vikunja", "vendor": "go-vikunja"}], "analysis": {"en": {"generated_at": "2026-03-27T17:52:35.248381+00:00", "value": {"mitigation_remediation": ["Upgrade Vikunja to version 2.2.1 or later to enforce account status checks across all authentication methods.", "If an upgrade cannot be performed immediately, revoke or delete all API tokens that belong to disabled or locked accounts.", "Disable CalDAV access for disabled or locked users either through configuration or by removing their CalDAV credentials.", "Limit or block OpenID Connect authentication for accounts marked as disabled or locked if the platform provides such configuration options.", "After implementing the fixes, monitor application logs for any further unauthorized authentication attempts and conduct periodic reviews of token usage."], "summary": {"action": "Immediate Patch", "impact": "Authentication bypass for disabled or locked accounts"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the self\u2011hosted Vikunja platform from version 0.18.0 through 2.2.0 inclusive. All deployments of the package identified by the vendor go-vikunja up to and including the 2.2.0 release are susceptible until the application is updated to version 2.2.1 or later, which restores proper status checks for all authentication pathways.", "description_and_impact": "A flaw in the Vikunja task\u2011management platform allows users whose accounts are marked disabled or locked to authenticate through API tokens, CalDAV basic authentication, and OpenID Connect. Because the status check is only applied to local logins and JWT token refreshes, these alternate authentication paths do not enforce the disabled/locked flag, meaning that such accounts can still access data that should otherwise be inaccessible. This effectively elevates the attacker\u2019s privileges to that of a legitimate authenticated user, posing risk to data confidentiality and integrity.", "risk_and_exploitability": "With a CVSS score of 7.1 the issue is categorized as medium\u2011high severity, while the EPSS score of less than 1% indicates a low likelihood of exploitation. The vulnerability is not listed in the CISA KEV catalog. However, based on the description, it is inferred that an attacker can remotely exploit the flaw by supplying a valid API token, CalDAV credentials, or OpenID Connect cookies, thereby bypassing the disabled/locked status and gaining unauthorized access to the system."}}}}, "created": "2026-03-25T11:47:11.791993+00:00", "updated": "2026-03-27T20:26:41.808315+00:00", "vendors": ["go-vikunja", "go-vikunja$PRODUCT$vikunja"]}