CVE-2026-104965

MEDIUM 5.4

Plane: Cross-Tenant Issue Relation Creation via IDOR

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-639
Vendor	makeplane
Product	plane
Published	Oct 5, 2026
Last Updated	Oct 5, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

makeplane / plane

< 1.4.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/makeplane/plane/security/advisories/GHSA-8cvv-8jh5-g6mj github.com: https://github.com/makeplane/plane/pull/9269 github.com: https://github.com/makeplane/plane/commit/81d9873d7f1cf1d1252ed53c12dd33696be73a89 github.com: https://github.com/makeplane/plane/releases/tag/v1.4.0