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CVE-2026-46650— Joplin: Stored XSS in public share viewer via javascript: URL bypass in isAcceptedUrl

Quick assessment

Affected
laurent22 joplin
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Joplin 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:

CVSS 4.4 · Medium EPSS 0.23% · P14

Affected Version Matrix 1

VendorProduct Version RangeStatus
laurent22 joplin < 3.7.2 affected
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I. Basic Information for CVE-2026-46650

Vulnerability Information

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Vulnerability Title
Joplin: Stored XSS in public share viewer via javascript: URL bypass in isAcceptedUrl
Source: CVE Program / CVE List V5
Vulnerability Description
Joplin 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
laurent22 joplin < 3.7.2 -

II. Public POCs for CVE-2026-46650

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III. Intelligence Information for CVE-2026-46650

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Patches & Fixes for CVE-2026-46650 (2)

Other References for CVE-2026-46650 (1)

Same Patch Batch · laurent22 · 2026-09-21 · 11 CVEs total

CVE-2026-46649 9.1 CRITICAL Joplin: SSO Auth Code Login Missing Rate Limiting — 9-Digit Numeric Code Brute-Forceable v
CVE-2026-55105 7.7 HIGH Joplin: Fountain embeds allow arbitrary script execution in published notes and the note v
CVE-2026-59814 7.6 HIGH Joplin: Stored XSS via inline-served note attachment on published shares
CVE-2026-55210 7.4 HIGH Joplin: SAML SSO account takeover via email-based account linking (missing is_external che
CVE-2026-49450 7.1 HIGH Joplin desktop Windows auto-updater accepts signed installer from any publisher because ap
CVE-2026-49453 7.0 HIGH Joplin: Path traversal in resource sync — silent arbitrary file write outside the resource
CVE-2026-55179 6.5 MEDIUM Joplin: Logic error in Joplin Server allows a signed-in user to read any note from its int
CVE-2026-59816 4.3 MEDIUM Joplin: Path traversal in transcribe proxy endpoint via URL-encoded slash
CVE-2026-59815 4.3 MEDIUM Joplin: Pending share recipients can write items into shared folders before accepting invi
CVE-2026-49449 2.5 LOW Joplin: KaTeX `trust:true` enables URL-allowlist bypass leading to NTLMv2 credential theft

IV. Related Vulnerabilities

Same product: joplin
Same vendor: laurent22
Same weakness: CWE-79

V. Comments for CVE-2026-46650

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