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.

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.

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

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. 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

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