---
id: CVE-2026-86174
title: >-
  Plane through 1.4.2 fails to validate that issues belong to the deploy board's
  project in the public comment endpoint
summary: >-
  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 …
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-639
vendor: makeplane
product: plane
affected:
  - plane <= 1.4.2
published: '2026-09-05'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T13:42:45.717'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86174'
references:
  - url: 'https://github.com/makeplane/plane'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/makeplane/plane/blob/v1.4.2/apps/api/plane/space/views/issue.py#L258-L275
    label: disclosure@vulncheck.com
  - url: 'https://github.com/makeplane/plane/issues/9441'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/plane-through-1.4.2-arbitrary-comment-write-via-public-deploy-board
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00336
epssPercentile: 0.24323
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-10T14:19:11.934688Z'
ingestedAt: '2026-09-06T07:51:56.494Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.