Auth bypass in Laurent22 Joplin
CVE-2026-59815
Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.7.7, Joplin Server's ItemModel.checkIfAllowed() authorizes writes to items with a share ID when any share_users row exists for the caller, without requiring ShareUserStatus.Accepted. A low-privileged authenticated user with a pending folder-share invitation can create an item under the share ID, and ShareModel.updateSharedItems3() propagates the injected content to the owner and accepted participants before the attacker accepts the invitation. This issue is fixed in version 3.7.7.
Vulnerability class: Broken Access Control
Published · last modified .
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:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (14.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 14.2% 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: 0.002 · change: 0.000
Affected products
- Laurent22 Joplin — versions < 3.7.7
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-59815?
- CVE-2026-59815 is a medium-severity vulnerability in Laurent22 Joplin, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-09-21.
- How severe is CVE-2026-59815?
- Medium severity. CVSS v3 base score is 4.3 out of 10.