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

> An attacker with sync target access can write arbitrary files outside the resource directory via path traversal in Joplin, potentially leading to code execution.

- **Severity:** High 7.0 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 21 Sep 2026
- **Updated:** 22 Sep 2026
- **Also known as:** GHSA-r24r-gp6h-cwgf

## What is CVE-2026-49453?

CVE-2026-49453 is a high-severity path traversal vulnerability in laurent22 joplin, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2026-49453?


## How do I fix CVE-2026-49453?

No fix has been published for CVE-2026-49453 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-49453 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49453 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-49453 and fix it if it is affected.

What it is: CVE-2026-49453 is a high-severity path traversal vulnerability in laurent22 joplin, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49453 exists.

Affected product: laurent22 joplin. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-49453/ (Markdown: https://insights.sbomify.com/CVE-2026-49453/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-49453
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-49453
- OSV: https://osv.dev/vulnerability/CVE-2026-49453

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-49453/
Summaries are generated and may contain mistakes; the official description above is the record.