What is CVE-2026-39843?

CVE-2026-39843 is a high-severity vulnerability in Makeplane Plane, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-04-09.

How severe is CVE-2026-39843?

High severity. CVSS v3 base score is 7.7 out of 10.

SSRF in Makeplane Plane

CVE-2026-39843

Plane is an an open-source project management tool. From 0.28.0 to before 1.3.0, the remediation of GHSA-jcc6-f9v6-f7jw is incomplete which could lead to the same full read Server-Side Request Forgery when a normal html page contains a lin…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.000 (11.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

Affected products

Makeplane Plane — versions >= 0.28.0, < 1.3.0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

https://github.com/makeplane/plane/security/advisories/GHSA-9fr2-pprw-pp9j (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-39843?: CVE-2026-39843 is a high-severity vulnerability in Makeplane Plane, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-04-09.
How severe is CVE-2026-39843?: High severity. CVSS v3 base score is 7.7 out of 10.