Vulnerability · Published Sep 5, 2026 · Assigned by VulnCheck
CVE-2026-86174Plane through 1.4.2 Arbitrary Comment Write via Public Deploy Board
Medium 4.3
In plain English
A medium-severity authorization bypass via user-controlled key in plane from makeplane. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities).
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.3%top 72.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
References
- GitHub Issue #9441 issue-tracking
- IssueCommentPublicViewSet.create technical-description
- https://github.com/makeplane/plane product
- VulnCheck Advisory: Plane through 1.4.2 Arbitrary Comment Write via Public Deploy Board third-party-advisory