What is CVE-2026-117563?

CVE-2026-117563 is a medium-severity vulnerability in Zmister2016 Mrdoc, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.4/10. Published 2026-10-27.

How severe is CVE-2026-117563?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Auth bypass in Zmister2016 Mrdoc

CVE-2026-117563

MrDoc through 1.1.1 contains a broken access control vulnerability in the manage_doc_share type 3 branch that allows authenticated users to modify other users' document share settings because updates lack an ownership check. Attackers can compute predictable share tokens from the MD5 of document ID and username to re-enable disabled shares or remove access codes, exposing private documents.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-10-27 · last modified 2026-10-27.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/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/issues/208 (issue-tracking)
github.com/zmister2016/MrDoc (product)
github.com/zmister2016/MrDoc/commit/2cd13ff0659dbef9aea59d5af122a21204942262 (patch)
github.com/zmister2016/MrDoc/blob/v1.1.1/app_doc/views.py (technical-description)
www.vulncheck.com/advisories/mrdoc-through-1.1.1-broken-access-control-via-mana… (third-party-advisory)

Frequently asked questions

What is CVE-2026-117563?: CVE-2026-117563 is a medium-severity vulnerability in Zmister2016 Mrdoc, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.4/10. Published 2026-10-27.
How severe is CVE-2026-117563?: Medium severity. CVSS v3 base score is 5.4 out of 10.