Quick answers
- Is CVE-2026-105639 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-105639 being exploited in the wild.
- How severe is CVE-2026-105639?
- Critical severity, with a CVSS score of 9.8, published 5 October 2026.
- Which products and versions are affected?
- Plane before 1.4.0.
- Is there a fix for CVE-2026-105639?
- Yes: fixed in 1.4.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-105639 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-105639?
- Check whether you run Plane at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 1.4.0
Technical details
The vulnerability stems from two issues in the signup and invitation flow: the signup creates a User account for any submitted email without out-of-band verification (since User.email is globally unique), and the invitation enumeration endpoint returns invitation tokens in full to any authenticated user whose email matches the invite recipient. An attacker with knowledge of a target email registers, queries the invitations endpoint to find pending invites, and uses the disclosed token to join workspaces without the target's permission.
Affected products
- Plane Plane before 1.4.0
Timeline
- 2026-10-05: disclosed
- 2026-06-23: patched