{"id":"CVE-2026-105639","revision":"4366799e3d7f4df0ac4a4702e92192e1","records":[{"revision":"4366799e3d7f4df0ac4a4702e92192e1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-105639","aliases":[],"title":"Plane: Pre-auth workspace invitation hijack via email-squat and self-served invitation token leak in Plane","description":"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.","state":0,"publishedAt":"2026-10-05T18:10:35.787+00:00","modifiedAt":"2026-10-06T14:52:44.084+00:00","affected":[{"ecosystem":"Vendor product","name":"plane","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"makeplane\",\n                    \"product\": \"plane\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.4.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://github.com/makeplane/plane/security/advisories/GHSA-4vj8-p63v-8p24","https://github.com/makeplane/plane/pull/9297","https://github.com/makeplane/plane/commit/6220ba990b2276a1a1979d1d5df68f650b8b47ad","https://github.com/makeplane/plane/releases/tag/v1.4.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-105639","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-105639","identifiers":["CVE-2026-105639"]},"retained":false,"historicalAffected":[]}],"coverage":[]}