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Vulnerability record · CVE-2026-59814 · published 21 September 2026

CVE-2026-59814: Cross-site scripting vulnerability

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 GET /shares/:id?resource_id= route serves a resource with the attacker-controlled mime value and omits Content-Disposition when the resource title is empty. A low-privileged user can publish an empty-title image/svg+xml attachment whose script executes when a victim opens the public share. By default, user content shares the Joplin Server application origin, allowing the script to access same-origin data and, when the victim is authenticated, perform actions with the victim's session, including reading administrative data and anti-CSRF tokens. Installations that configure USER_CONTENT_BASE_URL to a separate origin still execute the script, but on that separate user-content origin rather than the application origin. This issue is fixed in version 3.7.7.

7.6 CVSS 3.1 High EPSS 0.35% · top 73.9% CWE-79 · Cross-site scripting Deferred
7.6CVSS 3.1 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
23 Sep 2026Last modified by NVD

Description

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 GET /shares/:id?resource_id= route serves a resource with the attacker-controlled mime value and omits Content-Disposition when the resource title is empty. A low-privileged user can publish an empty-title image/svg+xml attachment whose script executes when a victim opens the public share. By default, user content shares the Joplin Server application origin, allowing the script to access same-origin data and, when the victim is authenticated, perform actions with the victim's session, including reading administrative data and anti-CSRF tokens. Installations that configure USER_CONTENT_BASE_URL to a separate origin still execute the script, but on that separate user-content origin rather than the application origin. This issue is fixed in version 3.7.7.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

References

LinkTags
https://github.com/laurent22/joplin/commit/920cd8f463bf9bbce9daa07581676123007118e5
https://github.com/laurent22/joplin/pull/15787
https://github.com/laurent22/joplin/security/advisories/GHSA-mx98-7h4g-6gmh
https://github.com/laurent22/joplin/security/advisories/GHSA-mx98-7h4g-6gmh

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Source: NIST National Vulnerability Database (record CVE-2026-59814), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.