{"id":"CVE-2026-62367","revision":null,"records":[{"revision":"272611cb808b47fbb65d1b9716c3ea1f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-62367","aliases":[],"title":"Vikunja: OIDC email-fallback account linking ignores email_verified, enabling local-account takeover","description":"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.","state":0,"publishedAt":"2026-10-09T20:49:08.891+00:00","modifiedAt":"2026-10-13T20:25:26.027+00:00","affected":[{"ecosystem":"Vendor product","name":"vikunja","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"go-vikunja\",\n                    \"product\": \"vikunja\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 1.0.0, < 2.4.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":7.5,"severity":"HIGH"}],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xv7q-fvmc-jx96","https://github.com/go-vikunja/vikunja/commit/7854f2729ab72000210b61c25929678fd6901630","https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-62367","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-62367","identifiers":["CVE-2026-62367"]},"retained":false,"historicalAffected":[]},{"revision":"2fdb322d208d4362b6f1a0ad141bcfdf","observedAt":"2026-11-08T01:58:38.303+00:00","statement":{"source":"euvd","id":"EUVD-2026-95993","aliases":["CVE-2026-62367","GHSA-xv7q-fvmc-jx96"],"title":"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-existi…","description":"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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"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","score":7.5,"severity":null}],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xv7q-fvmc-jx96","https://github.com/go-vikunja/vikunja/commit/7854f2729ab72000210b61c25929678fd6901630","https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-95993","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Oct 9, 2026, 8:49:08 PM","dateUpdated":"Oct 13, 2026, 8:25:26 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-95993","identifiers":["EUVD-2026-95993","CVE-2026-62367","GHSA-xv7q-fvmc-jx96"]},"retained":false,"historicalAffected":[]},{"revision":"2a65eaa500d64d4fa3cd7528201e1902","observedAt":"2026-10-25T14:19:28.838+00:00","statement":{"source":"nvd","id":"CVE-2026-62367","aliases":[],"title":"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-existi…","description":"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.","state":0,"publishedAt":"2026-10-09T21:17:05.47+00:00","modifiedAt":"2026-10-16T20:04:29.76+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":7.5,"severity":"HIGH"}],"references":["https://github.com/go-vikunja/vikunja/commit/7854f2729ab72000210b61c25929678fd6901630","https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0","https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xv7q-fvmc-jx96"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-62367","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-287","CWE-290","CWE-345"],"productCriteria":[],"sourceDates":{"published":"2026-10-09T21:17:05.470","lastModified":"2026-10-16T20:04:29.760"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-62367","identifiers":["CVE-2026-62367"]},"retained":false,"historicalAffected":[]},{"revision":"c441b51eb6eb4e9e8f19260a7040ac18","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-xv7q-fvmc-jx96","aliases":["CVE-2026-62367","GO-2026-6758"],"title":"Vikunja: OIDC email-fallback account linking ignores email_verified, enabling local-account takeover","description":"## Summary\n\nWith the per-provider OIDC `emailfallback` option enabled, Vikunja links an SSO login to a pre-existing **local** (username+password) account using only the `email` claim — no `email_verified` (or Microsoft `xms_edov`) check and no password check, on the unauthenticated callback. An attacker who can make the configured issuer emit a token bearing a victim's email logs in as that victim with a full session and no victim interaction (the nOAuth / Grafana CVE-2023-3128 class). The 2.3.0 fix for GHSA-8jvc-mcx6-r4cg added a TOTP gate, not an `email_verified` gate, so users without TOTP remain exposed.\n\n## Details\n\nReferences are `pkg/modules/auth/openid/openid.go` at HEAD. Identity is first resolved on the immutable `(issuer, subject)` pair (`openid.go:428`). On a subject miss with `emailfallback` on, `fallbackSearchUsers` adds an email-only lookup against local accounts:\n\n```go\n// openid.go:413\nsearches = append(searches, &user.User{Issuer: user.IssuerLocal, Email: cl.Email})\n```\n\n`getUser` resolves this via `s.Get()`, which ANDs non-zero fields -> `WHERE issuer='local' AND email=?`. Local users always have `Issuer=\"local\"` (`user_create.go:38`), so the lookup matches any local account by email alone; `getOrCreateUser` returns it and the caller mints a session — the password is never read. The `claims` struct has no `email_verified` field (`openid.go:80`) and `getClaims` never consults one; a repo-wide grep for `email_verified`/`xms_edov` returns nothing. The code already warns about this at `openid.go:388` (\"Discouraged for untrusted providers where someone can set email without verification\") — but enforces nothing.\n\n## Impact\n\nUnauthenticated takeover of any existing **local** account (read/write/delete its projects, tasks, attachments, shares), bypassing the password. Scope notes: only `issuer='local'` accounts are matched (not pure-SSO users); the attacker's `sub` is not bound to the victim record, but the attack is repeatable; TOTP users are protected by the 2.3.0 `enforceTOTPIfRequired` gate (`openid.go:250`), non-TOTP users are not.\n\n## Preconditions\n\n1. Admin enabled `emailfallback: true` (defaults false — a default install is unaffected).\n2. The configured issuer lets the attacker assert the victim's unverified email: a self-service IdP (Keycloak/Authentik/Auth0/Dex with editable email), a mixed federation, or a multi-tenant Entra `/common` app. `iss`/`aud` are pinned, but the attacker controls `email`, not the issuer.\n3. The victim has a local account.\n\nNot reachable against a single-tenant IdP that verifies email and disallows self-set addresses.\n\n## Recommended Fix\n\nAdd `email_verified` to the `claims` struct and require it `true` on the email-fallback branch before linking to a local account; reject when absent/false. For Entra also require `xms_edov` and pin multi-tenant configs to an allowed-tenant list. Fail closed on an email collision not backed by a verified email from a trusted single-tenant issuer rather than silently logging the caller in.","state":0,"publishedAt":"2026-10-09T20:49:06+00:00","modifiedAt":"2026-10-19T21:40:54.2886837+00:00","affected":[{"ecosystem":"Go","name":"code.vikunja.io/api","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.0.0"},{"kind":"fixed","version":"2.4.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xv7q-fvmc-jx96","https://github.com/go-vikunja/vikunja/commit/7854f2729ab72000210b61c25929678fd6901630","https://github.com/go-vikunja/vikunja","https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0"],"sourceUrl":"https://github.com/advisories/GHSA-xv7q-fvmc-jx96","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-xv7q-fvmc-jx96","identifiers":["GHSA-xv7q-fvmc-jx96","CVE-2026-62367","GO-2026-6758"]},"retained":false,"historicalAffected":[]},{"revision":"7a727cbeae35495fb0b5be83a258e595","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-6758","aliases":["CVE-2026-62367","GHSA-xv7q-fvmc-jx96"],"title":"Vikunja: OIDC email-fallback account linking ignores email_verified, enabling local-account takeover in code.vikunja.io/api","description":"Vikunja: OIDC email-fallback account linking ignores email_verified, enabling local-account takeover in code.vikunja.io/api.\n\nNOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.\n\n(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)\n\nThe additional affected modules and versions are: code.vikunja.io/api from v1.0.0 before v2.4.0.","state":0,"publishedAt":"2026-10-19T21:08:26+00:00","modifiedAt":"2026-10-19T21:31:49.9739951+00:00","affected":[{"ecosystem":"Go","name":"code.vikunja.io/api","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xv7q-fvmc-jx96","https://github.com/go-vikunja/vikunja/commit/7854f2729ab72000210b61c25929678fd6901630","https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-6758","license":"OSV · upstream source license applies","key":"osv:GO-2026-6758","identifiers":["GO-2026-6758","CVE-2026-62367","GHSA-xv7q-fvmc-jx96"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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