Is CVE-2026-40265 actively exploited?

No active exploitation of CVE-2026-40265 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40265 be exploited remotely?

Yes. CVE-2026-40265 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40265?

CVE-2026-40265 has a CVSS score of 5.9 (MEDIUM).

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MEDIUM

CVE-2026-40265

CWE-862Published: April 17, 2026· Updated: Apr 17, 2026

5.9

CVSS v3.1

EPSS:0.10%probability of exploitation in 30 daysPercentile:26.4th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-40265 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 5.9.