# CVE-2026-59816: Joplin Server path traversal in transcribe proxy

Source: https://junglewise.ai/threats/cve-2026-59816-joplin-is-an-open-source-note-taking-and-to-do-application-that  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-21. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-59816 · Severity: medium · CVSS 4.3 · Published 2026-09-21

Joplin Server is a note-taking application with optional transcription support. When transcription is enabled, authenticated users can exploit URL-encoded path segments to bypass access controls and reach internal transcription backend endpoints, potentially exposing administrative data, health metrics, and configuration information.

Technologies: [Joplin Server](https://junglewise.ai/threats/technologies/joplin-server). Vendors: [Joplin](https://junglewise.ai/threats/vendors/joplin).

## Quick answers

**Is CVE-2026-59816 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-59816 being exploited in the wild.

**How severe is CVE-2026-59816?** Medium severity, with a CVSS score of 4.3, published 21 September 2026.

**Which products and versions are affected?** Joplin Server before 3.7.7.

**Is there a fix for CVE-2026-59816?** A patch was published on 2026-09-21: fixed in version 3.7.7 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-59816 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-59816?** Check whether you run Joplin Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A path traversal vulnerability in the GET and POST /api/transcribe/:id handlers in packages/server/src/routes/api/transcribe.ts allows authenticated users to inject URL-encoded slashes (%2F) that are decoded after routing, causing the server to construct URLs that escape the intended /transcribe/ prefix. An attacker can craft requests like GET /api/transcribe/..%2Fadmin to proxy requests to arbitrary endpoints on the transcription backend (e.g., /admin or /health), revealing internal data. The vulnerability requires TRANSCRIBE_ENABLED=true (disabled by default) and valid authentication, and is fixed by validating the job ID against an allowlist of safe characters before URL interpolation.

## Affected products

- Joplin Joplin Server before 3.7.7

## Timeline

- 2026-09-21: disclosed
- 2026-09-21: patched: fixed in version 3.7.7

## References

- [https://github.com/laurent22/joplin/commit/d97a5091a35c2923984d3777320500b594afcdce](https://github.com/laurent22/joplin/commit/d97a5091a35c2923984d3777320500b594afcdce)
- [https://github.com/laurent22/joplin/security/advisories/GHSA-r7wp-3494-fwf4](https://github.com/laurent22/joplin/security/advisories/GHSA-r7wp-3494-fwf4)

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- [Joplin Server account takeover via application authorization bypass](https://junglewise.ai/threats/cve-2026-105786-joplin-is-an-open-source-note-taking-and-to-do-application-that)
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