Auth bypass in Makeplane Plane
CVE-2026-104978
Plane is an open-source project management tool. Prior to 1.4.0, Plane's project invitation list endpoint is accessible to any authenticated user who knows the workspace slug and project ID, while the public project invitation join endpoint accepts an invitation based only on a submitted email address. When a pending invitation targets an email address that has not registered with Plane, an attacker can enumerate the invitation, register an account using the invited email without mailbox verification, and accept the invitation. The attacker-controlled account is then added to the target workspace and project. This issue is fixed in 1.4.0.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/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)
References
Frequently asked questions
- What is CVE-2026-104978?
- CVE-2026-104978 is a high-severity vulnerability in Makeplane Plane, classified under Incorrect Authorization. CVSS score: 8.2/10. Published 2026-10-05.
- How severe is CVE-2026-104978?
- High severity. CVSS v3 base score is 8.2 out of 10.