{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-62367", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-13T22:04:59.677Z", "datePublished": "2026-10-09T20:49:08.891Z", "dateUpdated": "2026-10-13T20:25:26.027Z"}, "containers": {"cna": {"title": "Vikunja: OIDC email-fallback account linking ignores email_verified, enabling local-account takeover", "problemTypes": [{"descriptions": [{"cweId": "CWE-287", "lang": "en", "description": "CWE-287: Improper Authentication", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-290", "lang": "en", "description": "CWE-290: Authentication Bypass by Spoofing", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-345", "lang": "en", "description": "CWE-345: Insufficient Verification of Data Authenticity", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xv7q-fvmc-jx96", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xv7q-fvmc-jx96"}, {"name": "https://github.com/go-vikunja/vikunja/commit/7854f2729ab72000210b61c25929678fd6901630", "tags": ["x_refsource_MISC"], "url": "https://github.com/go-vikunja/vikunja/commit/7854f2729ab72000210b61c25929678fd6901630"}, {"name": "https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0"}], "affected": [{"vendor": "go-vikunja", "product": "vikunja", "versions": [{"version": ">= 1.0.0, < 2.4.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-09T20:49:08.891Z"}, "descriptions": [{"lang": "en", "value": "Vikunja is an open-source self-hosted task management platform. In versions 1.0.0 through 2.3.0, when an administrator enables the per-provider `emailfallback` option on an OpenID Connect provider, Vikunja links an SSO login to a pre-existing local (username+password) account using only the `email` claim from the IdP. The fallback never checks an `email_verified` (or Microsoft `xms_edov`) signal and never requires the matched account's password. An attacker who can obtain a token from the configured issuer carrying a victim's email logs in as that victim with a full session, with no consent or interaction from the victim. Version 2.4.0 fixes the issue."}], "source": {"advisory": "GHSA-xv7q-fvmc-jx96", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-13T20:14:20.538444Z", "id": "CVE-2026-62367", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-13T20:25:26.027Z"}}]}}

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