CVE-2026-105639 Plane - Authentication Bypass & Broken Access Control

Plane < 1.4.0 contains an authentication bypass caused by lack of out-of-band email ownership verification in signup flow, letting unauthenticated attackers register as target users and join workspaces via invitation tokens, exploit requires attacker to register with target email.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.39% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication, Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
5 October 2026
Updated
15 October 2026
Weakness
CWE-200

Vendor fix

Update to version 1.4.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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