Vulnerability · Published Apr 7, 2026 · Assigned by GitHub_M

CVE-2026-39374Plane IDOR: Cross-Project Issue Date Modification via Bulk Update Endpoint

Medium 6.5

In plain English

A medium-severity authorization bypass via user-controlled key in plane from makeplane. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.2%top 87.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Plane is an an open-source project management tool. Prior to 1.3.0, the IssueBulkUpdateDateEndpoint allows a project member (ADMIN or MEMBER) to modify the start_date and target_date of ANY issue across the entire Plane instance, regardless of workspace or project membership. The endpoint fetches issues by ID without filtering by workspace or project, enabling cross-boundary data modification. This vulnerability is fixed in 1.3.0.

Affected products (as reported)

Vendor	Product	Versions
makeplane	plane	< 1.3.0

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

References

https://github.com/makeplane/plane/security/advisories/GHSA-4q54-h4x9-m329 x_refsource_CONFIRM