What is CVE-2026-104965?

CVE-2026-104965 is a medium-severity vulnerability in Makeplane Plane, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.4/10. Published 2026-10-05.

How severe is CVE-2026-104965?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in Makeplane Plane

CVE-2026-104965

Plane is an open-source project management tool. Prior to 1.4.0, the issue-relation endpoint accepts issue UUIDs in the request body without validating that they belong to the caller's workspace. An authenticated user can create relations linking their own issues to issues in any other workspace on the instance, leaking issue metadata through activity events. 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 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/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-2026-104965?: CVE-2026-104965 is a medium-severity vulnerability in Makeplane Plane, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.4/10. Published 2026-10-05.
How severe is CVE-2026-104965?: Medium severity. CVSS v3 base score is 5.4 out of 10.