CVE-2026-105639 (GCVE-0-2026-105639)

Vulnerability from cvelistv5 – Published: 2026-10-05 18:10 – Updated: 2026-10-05 18:10
VLAI
Title
Plane: Pre-auth workspace invitation hijack via email-squat and self-served invitation token leak in Plane
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-287 - Improper Authentication
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
Impacted products
Vendor Product Version
makeplane plane Affected: < 1.4.0
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        }
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        {
          "descriptions": [
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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          "name": "https://github.com/makeplane/plane/pull/9297",
          "tags": [
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      "source": {
        "advisory": "GHSA-4vj8-p63v-8p24",
        "discovery": "UNKNOWN"
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      "title": "Plane: Pre-auth workspace invitation hijack via email-squat and self-served invitation token leak in Plane"
    }
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    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-105639",
    "datePublished": "2026-10-05T18:10:35.787Z",
    "dateReserved": "2026-10-05T16:40:39.612Z",
    "dateUpdated": "2026-10-05T18:10:35.787Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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                "vendor": "makeplane",
                "versions": [
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                    "version": "\u003c 1.4.0"
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            "value": "Plane is an open-source project management tool. Prior to 1.4.0, Plane\u0027s 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\u0027s 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\u0027s 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."
          }
        ],
        "id": "CVE-2026-105639",
        "lastModified": "2026-10-05T19:17:18.343",
        "metrics": {
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        "published": "2026-10-05T19:17:18.213",
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            "url": "https://github.com/makeplane/plane/commit/6220ba990b2276a1a1979d1d5df68f650b8b47ad"
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}



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