{"schema":"threatline.record/2","record":{"id":"CVE-2026-105639","aliases":["GHSA-4vj8-p63v-8p24"],"summary":"Plane: Pre-auth workspace invitation hijack via email-squat and self-served invitation token leak in Plane","details":"Plane is an open-source project management tool. Prior to 1.4.0, Plane's signup flow creates a logged-in User row for any submitted email without an out-of-band ownership check, while User.email is unique=True. The authenticated user can call GET /api/users/me/workspaces/invitations/, which returns each WorkspaceMemberInvite whose email matches request.user.email. WorkSpaceMemberInviteSerializer uses fields = \"all\", exposing the token that protects the invitation join endpoint. An unauthenticated attacker who knows a target's email can register an account using that address, enumerate pending invitations, and accept an invitation as the target, joining a workspace at the invited role. The term pre-auth describes the attacker's initial state: the attacker has no credential before signup, while the enumeration and join requests use the session created by that signup. This issue is fixed in 1.4.0.","categories":["Unclassified"],"product":"plane","vendor":"makeplane","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-105639","source_modified_at":"2026-10-06T14:52:44.084Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"plane","vendor":"makeplane","versions":[{"version":"< 1.4.0","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":9.8,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00394,"percentile":0.32392,"score_date":"2026-10-23"},"published_at":"2026-10-05T18:10:35.787Z","modified_at":"2026-10-06T14:52:44.084Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-105639","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-10-06T14:52:44.084Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-105639","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/makeplane/plane/security/advisories/GHSA-4vj8-p63v-8p24","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/makeplane/plane/pull/9297","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/makeplane/plane/commit/6220ba990b2276a1a1979d1d5df68f650b8b47ad","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/makeplane/plane/releases/tag/v1.4.0","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"total","assessed_at":"2026-10-06T14:37:11.181590Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-06T14:52:44.084Z","content_hash":"75519e21e5c2290ec7cf4aa2ca146a0c35a76ad0e91189154622c731a576076e"}}