# CVE-2026-40265: Note Mark has Broken Access Control on Asset Download

Source: https://junglewise.ai/threats/cve-2026-40265-note-mark-has-broken-access-control-on-asset-download  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-17. Updated: 2026-05-11  
License: CC BY 4.0 with a link back

CVE-2026-40265 · Severity: medium · CVSS 5.9 · Published 2026-04-17

Note Mark is an open-source note-taking application. In versions 0.19.1 and prior, the asset download endpoint at /api/notes/{noteID}/assets/{assetID} is registered without authentication middleware, and the backend query does not verify ownership or book visibility. An unauthenticated user who knows a valid note ID and asset ID can retrieve the full contents of private note assets without authentication, regardless of whether the associated book is public or private. This issue has been fixed in version 0.19.2.

Technologies: [github.com/enchant97/note-mark/backend (Go)](https://junglewise.ai/threats/technologies/github-com-enchant97-note-mark-backend). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-40265 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-40265 being exploited in the wild.

**How severe is CVE-2026-40265?** Medium severity, with a CVSS score of 5.9, published 17 April 2026.

**Which products and versions are affected?** github.com/enchant97/note-mark/backend (Go) < 0.0.0-20260411145023-6593898855ad, SEMVER:introduced=0,fixed=0.0.0-20260411145023-6593898855ad.

**Is there a fix for CVE-2026-40265?** Yes. github.com/enchant97/note-mark/backend (Go): upgrade to 0.0.0-20260411145023-6593898855ad or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-40265?** Check whether you run github.com/enchant97/note-mark/backend (Go) 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.

## How to fix

- github.com/enchant97/note-mark/backend (Go): upgrade to 0.0.0-20260411145023-6593898855ad or later

  ```sh
  go get github.com/enchant97/note-mark/backend@v0.0.0-20260411145023-6593898855ad
  ```


## Affected products

- github.com/enchant97/note-mark/backend (Go) < 0.0.0-20260411145023-6593898855ad, SEMVER:introduced=0,fixed=0.0.0-20260411145023-6593898855ad

## Identifiers

- CVE-2026-40265
- GHSA-p5w6-75f9-cc2p
- GO-2026-5530

## References

- [https://api.github.com/users/QiaoNPC](https://api.github.com/users/QiaoNPC)
- [https://github.com/QiaoNPC](https://github.com/QiaoNPC)
- [https://api.github.com/users/QiaoNPC/gists%7B/gist_id%7D](https://api.github.com/users/QiaoNPC/gists%7B/gist_id%7D)
- [https://api.github.com/users/QiaoNPC/repos](https://api.github.com/users/QiaoNPC/repos)
- [https://avatars.githubusercontent.com/u/165803850?v=4](https://avatars.githubusercontent.com/u/165803850?v=4)
- [https://api.github.com/users/QiaoNPC/events%7B/privacy%7D](https://api.github.com/users/QiaoNPC/events%7B/privacy%7D)

## Related threats

- [Note Mark path traversal in migrate export via unsanitized slugs](https://junglewise.ai/threats/cve-2026-50553-note-mark-path-traversal-in-migrate-export-via-unsanitized-slugs)
- [Note Mark information disclosure of soft-deleted notes in public books](https://junglewise.ai/threats/cve-2026-50554-note-mark-information-disclosure-of-soft-deleted-notes-in-public)
- [enchant97 Note Mark weak JWT secret allows account takeover](https://junglewise.ai/threats/cve-2026-44523-enchant97-note-mark-weak-jwt-secret-allows-account-takeover)
- [enchant97 Note Mark path traversal in asset upload](https://junglewise.ai/threats/cve-2026-44522-enchant97-note-mark-path-traversal-in-asset-upload)
- [Note Mark: Unauthenticated read of notes and assets in soft-deleted public books](https://junglewise.ai/threats/cve-2026-41572-note-mark-unauthenticated-read-of-notes-and-assets-in-soft)