What is CVE-2026-104964?

CVE-2026-104964 is a medium-severity vulnerability in Makeplane Plane, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.8/10. Published 2026-10-05.

How severe is CVE-2026-104964?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Auth bypass in Makeplane Plane

CVE-2026-104964

Plane is an open-source project management tool. Prior to 1.4.0, Plane's project update endpoint authorizes the caller against the workspace slug in the request URL but loads the target project globally by UUID without binding it to that workspace. An administrator of one workspace can modify a project in another workspace when the victim project UUID is known. This violates tenant isolation and permits unauthorized cross-workspace changes to project metadata and configuration. This issue is fixed in 1.4.0.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-10-05 · last modified 2026-10-05.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Makeplane Plane — versions < 1.4.0

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

Frequently asked questions

What is CVE-2026-104964?: CVE-2026-104964 is a medium-severity vulnerability in Makeplane Plane, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.8/10. Published 2026-10-05.
How severe is CVE-2026-104964?: Medium severity. CVSS v3 base score is 6.8 out of 10.