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Plane: Privilege Escalation: Project Guest Can Demote Admin/Member Roles

Type: advisorySources: OSV

Plane is an open-source project management tool. Prior to 1.3.0, the ProjectMemberViewSet.partial_update method allows any project member, including a user with the lowest GUEST role, to modify another project member's role. The authorization check prevents assigning a role higher than the requester's role but does not prevent assigning a lower or equal role, allowing a Guest to demote Administrators and Members and deny them project control. This vulnerability is fixed in 1.3.0.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-105634
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 08:27 UTC · Revision 1

Source evidence

Plane: Privilege Escalation: Project Guest Can Demote Admin/Member Roles

core-osv · Original source

Published 5 Oct 2026, 18:00 UTC

Plane is an open-source project management tool. Prior to 1.3.0, the ProjectMemberViewSet.partial_update method allows any project member, including a user with the lowest GUEST role, to modify another project member's role. The authorization check prevents assigning a role higher than the requester's role but does not prevent assigning a lower or equal role, allowing a Guest to demote Administrators and Members and deny them project control. This vulnerability is fixed in 1.3.0.

osv:CVE-2026-105634
Complete source record
{
  "id": "e1d0a58158138c63d2ab08338eca040e753ffea4fcfa3b0bf584059b743823a9",
  "url": "https://osv.dev/vulnerability/CVE-2026-105634",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Plane: Privilege Escalation: Project Guest Can Demote Admin/Member Roles",
    "summary": "Plane is an open-source project management tool. Prior to 1.3.0, the ProjectMemberViewSet.partial_update method allows any project member, including a user with the lowest GUEST role, to modify another project member's role. The authorization check prevents assigning a role higher than the requester's role but does not prevent assigning a lower or equal role, allowing a Guest to demote Administrators and Members and deny them project control. This vulnerability is fixed in 1.3.0.",
    "evidence": "osv:CVE-2026-105634",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-105634",
      "aliases": [
        "CVE-2026-105634",
        "GHSA-494h-3rcq-5g3c"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/makeplane/plane",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "cf696d200d3e222390a01ba20e833eb11a5ed881"
                },
                {
                  "fixed": "587fe76032fb69275866fdeb655699a70a83c521"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.3.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "587fe76032fb69275866fdeb655699a70a83c521"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "cf696d200d3e222390a01ba20e833eb11a5ed881"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.3.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.2.3",
            "v1.2.2",
            "v1.2.1",
            "v1.2.0",
            "v1.1.0",
            "v1.0.0",
            "v0.28.0",
            "v0.27.1",
            "v0.27.0",
            "v0.26.1",
            "v0.26.0",
            "v0.25.3",
            "v0.25.2",
            "v0.25.1",
            "v0.25.0",
            "v0.24.0",
            "v0.23.1",
            "v0.23.0",
            "v0.22-dev",
            "v0.21-dev",
            "v0.20-dev",
            "v0.19-dev",
            "v0.18-dev",
            "v0.17-dev",
            "v0.16-dev",
            "v0.15.4-dev",
            "v0.15.3-hotfix",
            "v0.15.2-dev",
            "v0.15.1-dev",
            "v0.15-dev",
            "v0.14.2-dev",
            "v0.14.1-dev",
            "v0.14-dev",
            "v0.13.2-dev",
            "v0.13.1-dev",
            "v0.13-dev",
            "v0.12.2-dev",
            "v0.12.1-dev",
            "v0.12-dev",
            "v0.11-dev",
            "v0.10-dev",
            "v0.9-dev",
            "v0.8-dev",
            "v0.7.1-dev",
            "v0.7-dev",
            "v0.6-dev",
            "v0.5-dev",
            "v0.4-dev",
            "v0.3.1-dev",
            "v0.1-dev"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-105634.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.327255773Z",
      "provider": "osv",
      "references": [
        "https://github.com/makeplane/plane/releases/tag/v1.3.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105634.json",
        "https://github.com/makeplane/plane/security/advisories/GHSA-494h-3rcq-5g3c",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-105634",
        "https://github.com/makeplane/plane/commit/587fe76032fb69275866fdeb655699a70a83c521",
        "https://github.com/makeplane/plane/pull/8833"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-269"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105634.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-105634",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493823,
  "published_at": "2026-10-05T18:00:50.831+00:00"
}