CVE-2026-59814

7.6 HIGHpublic exploit available

Published 2026-09-21 · Updated 2026-09-21

AI risk analysis

Summary: The flaw allows a low-privileged user to publish an image/svg+xml attachment with executable script content that can access same-origin data and perform actions with the victim's session if they are authenticated.
Exploitability: Exploitation requires publishing a specific type of file and relies on victims opening the public share while authenticated. It is moderately easy given the conditions.
Blast radius: If exploited, it could lead to unauthorized access, data reading, and actions performed with the victim's session credentials, impacting user security significantly.
Prioritized remediation: Update Joplin Server to version 3.7.7 or later to mitigate this vulnerability.

rceauth-bypasswebsvgscript

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

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 vector

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

Weaknesses

CWE-79

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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