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Joplin: Fountain embeds allow arbitrary script execution in published notes and the note viewer

Type: advisorySource: Official CVE List1 source record

Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.6.15 and 3.7.2, packages/renderer/MdToHtml/rules/fountain.ts passes HTML generated by the vendored fountain.js renderer into note output without sanitizing it. A malicious Fountain code block can therefore execute script when Fountain rendering is enabled in desktop or mobile clients, or when a note is published through Joplin Server where Fountain rendering is enabled by default. The script can read content subsequently loaded in the reused note viewer or, when published notes are served from the same domain as server content, access data available to an authenticated browser in the server origin. This issue is fixed in versions 3.6.15 and 3.7.2.

Announced Source revision 1
Original source ↗

CVE-2026-55105

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-55105

joplin

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "laurent22",
    "product": "joplin",
    "versions": [
      {
        "status": "affected",
        "version": "< 3.6.15"
      },
      {
        "status": "affected",
        "version": ">= 3.7.0, < 3.7.2"
      }
    ]
  }
]
Related CVEs
CVE-2026-55105

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#1970 · Revision 1
Added to Heist Feed
Publisher date
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