CVE WatchOct 5, 2026

CVE-2026-105633

Plane is an open-source project management tool. Prior to 1.4.0, the V2 issue-attachment PATCH endpoint accepts issue_id in the URL but omit

CVSS

7.1

High

EPSS

0.3%

p21

KEV

—

Exploit Today

0-100

Published: Oct 5, 2026 · Last modified: Oct 5, 2026 · CWE-639

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-10-062026-10-21

Technical description

Plane is an open-source project management tool. Prior to 1.4.0, the V2 issue-attachment PATCH endpoint accepts issue_id in the URL but omits it from the database query. A project member can use an issue_id they control in the URL while targeting another user's attachment by its pk UUID. Because the server matches only pk, workspace, and project_id, it modifies the attachment regardless of the issue_id in the URL. When the attachment is pending and has not been confirmed as uploaded, the PATCH handler sets created_by = request.user and transfers attachment ownership to the attacker. This issue is fixed in 1.4.0.

Official references

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