What is CVE-2026-39374?

CVE-2026-39374 is a medium-severity vulnerability in Makeplane Plane, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-04-07.

How severe is CVE-2026-39374?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Makeplane Plane

CVE-2026-39374

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.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-04-07 · last modified 2026-07-24.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.003 (21.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Makeplane Plane — versions < 1.3.0
Plane

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

github.com/makeplane/plane/security/advisories/GHSA-4q54-h4x9-m329 (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-39374?: CVE-2026-39374 is a medium-severity vulnerability in Makeplane Plane, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-04-07.
How severe is CVE-2026-39374?: Medium severity. CVSS v3 base score is 6.5 out of 10.