What is CVE-2026-120427?

CVE-2026-120427 is a medium-severity vulnerability in Zmister2016 Mrdoc, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-11-02.

How severe is CVE-2026-120427?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Zmister2016 Mrdoc

CVE-2026-120427

MrDoc through 1.1.1 contains a missing authorization vulnerability in the get_doctemp view that allows authenticated users to read other users' document templates. Attackers can enumerate the sequential doctemp_id POST parameter to retrieve the private template content of every user on the instance.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-11-02 · last modified 2026-11-02.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Zmister2016 Mrdoc

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

github.com/zmister2016/MrDoc/commit/ec93679499fb6ea88ce868ffc9169fe025917095 (patch)
github.com/zmister2016/MrDoc/blob/v1.1.1/app_doc/views.py (technical-description)
github.com/zmister2016/MrDoc/releases/tag/v1.1.1 (release-notes)
hackmd.io/@hieund/mrdoc-get-doctemp-missing-owner-check-cross-user-template-read (technical-description)
www.vulncheck.com/advisories/mrdoc-through-1.1.1-missing-authorization-via-get-… (third-party-advisory)

Frequently asked questions

What is CVE-2026-120427?: CVE-2026-120427 is a medium-severity vulnerability in Zmister2016 Mrdoc, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-11-02.
How severe is CVE-2026-120427?: Medium severity. CVSS v3 base score is 4.3 out of 10.