CVE-2026-86174

MEDIUM 4.3

Plane through 1.4.2 Arbitrary Comment Write via Public Deploy Board

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

Plane through 1.4.2 fails to validate that issues belong to the deploy board's project in the public comment endpoint. Authenticated attackers can post comments to arbitrary issues across workspaces by supplying an issue_id parameter to the public deploy-board comment endpoint.

CWE	CWE-639
Vendor	makeplane
Product	plane
Published	Sep 5, 2026
Last Updated	Sep 10, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

makeplane / plane

0 ≤ 1.4.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/makeplane/plane/issues/9441 github.com: https://github.com/makeplane/plane/blob/v1.4.2/apps/api/plane/space/views/issue.py#L258-L275 github.com: https://github.com/makeplane/plane vulncheck.com: https://www.vulncheck.com/advisories/plane-through-1.4.2-arbitrary-comment-write-via-public-deploy-board

Credits

🔍 George Chen