Joplin: Stored XSS in public share viewer via javascript: URL bypass in isAcceptedUrl

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-46650
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-21 22:16:56 UTC
Updated2026-09-29 14:17:20 UTC
DescriptionJoplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.7.2, isAcceptedUrl() in packages/renderer/htmlUtils.ts uses an unanchored regular expression for internal resource URLs, allowing a javascript: URL containing a matching 32-character path fragment to pass validation and be emitted into an HTML note's link. A low-privileged Joplin Server user can publish the crafted HTML note as a public share. In the current build, ordinary left-click is blocked; demonstrated execution requires middle-click or Open in new tab in an older or non-hardened browser because current Chrome and Firefox block javascript: new-tab navigation. When execution succeeds, the script runs in the Joplin Server origin, can read page-visible content, and can make authenticated same-origin requests when the victim is signed in. This issue is fixed in version 3.7.2.

Risk And Classification

Primary CVSS: v3.1 4.4 MEDIUM from [email protected]

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

EPSS: 0.002950000 probability, percentile 0.198620000 (date 2026-09-29)

Problem Types: CWE-79 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED4.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Laurent22 Joplin affected < 3.7.2 Not specified

References

ReferenceSourceLinkTags
github.com/laurent22/joplin/commit/9fdc2d4adbd7b7326a2d0dcc32e12b705bfc285e [email protected] github.com
github.com/laurent22/joplin/security/advisories/GHSA-x9vj-jrqf-9wcm 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/laurent22/joplin/pull/15435 [email protected] github.com
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