CVE-2026-55105High· 7.7▾ MidnightPoC availableJoplin 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 …
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 42.4 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 23.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.3%
Last analysed / modified upstream
Exploit / PoC code exists
0.3% → 0.5%
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-105784Medium· 4.6Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks
CVE-2026-59814High· 7.6Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks
CVE-2026-46650Medium· 4.4Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks
CVE-2022-35131Critical· 9.0Joplin v2.8.8 allows attackers to execute arbitrary commands via a crafted payload injected into the Node titles.
CVE-2026-105785Medium· 4.8Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks
CVE-2026-105786High· 8.5Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks