CVE-2026-40265

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.9 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 63% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.9Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity59% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

April 17, 2026

Last Modified

April 17, 2026

Advisory Details (3)

Auto-updated Aug 2, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
github Patch Available🟡 PoC Available

Broken Access Control on Asset Download · Advisory · enchant97/note-mark · GitHub

https://github.com/enchant97/note-mark/security/advisories/GHSA-p5w6-75f9-cc2p
github_release Patch Available

V0.19.2

Patch available: enchant97/note-mark v0.19.2

https://github.com/enchant97/note-mark/releases/tag/v0.19.2
github_commit Patch Available

commit 6593898855ad (enchant97/note-mark)

Patch available: enchant97/note-mark v0.19.2 (contains commit 6593898855ad)

https://github.com/enchant97/note-mark/commit/6593898855add151eb9965d96998b05e14c62026

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/enchant97/note-mark/backend—0.0.0-20260411145023-6593898855ad—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 36× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 129 total refreshes for this CVE.

  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-23 00:19 UTCEPSS rescore
  3. 2026-08-21 23:49 UTCEPSS rescore
  4. 2026-08-20 22:55 UTCEPSS rescore
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  9. 2026-08-16 06:34 UTCEG score recompute
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  24. 2026-08-06 13:46 UTCEPSS rescore
  25. 2026-08-05 23:20 UTCEG score recompute
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  1. 2026-08-05 19:17 UTCEPSS rescore
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  3. 2026-08-04 10:38 UTCEPSS rescore
  4. 2026-08-03 21:32 UTCEG score recompute
  5. 2026-08-03 10:36 UTCEPSS rescore
  6. 2026-08-02 13:09 UTCEG score recompute
  7. 2026-08-02 02:27 UTCEPSS rescore
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  18. 2026-07-23 14:18 UTCEPSS rescore
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  20. 2026-07-23 03:11 UTCEG score recompute
  21. 2026-07-22 14:08 UTCEPSS rescore
  22. 2026-07-21 15:24 UTCEPSS rescore
  23. 2026-07-20 17:08 UTCEPSS rescore
  24. 2026-07-20 08:02 UTCOSV refresh
  25. 2026-07-19 02:29 UTCEPSS rescore
  26. 2026-07-18 10:04 UTCEPSS rescore
  27. 2026-07-16 17:03 UTCEPSS rescore
  28. 2026-07-15 16:57 UTCEPSS rescore
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  36. 2026-07-09 19:10 UTCEPSS rescore
  37. 2026-07-08 15:15 UTCEPSS rescore
  38. 2026-07-07 13:46 UTCEPSS rescore
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  46. 2026-06-30 23:22 UTCEPSS rescore
  47. 2026-06-29 14:06 UTCEPSS rescore
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  49. 2026-06-28 04:56 UTCEPSS rescore
  50. 2026-06-27 03:08 UTCEPSS rescore
  51. 2026-06-25 13:49 UTCEPSS rescore
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  53. 2026-06-24 14:05 UTCEPSS rescore
  54. 2026-06-23 21:33 UTCEPSS rescore
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  65. 2026-06-15 17:49 UTCEPSS rescore
  66. 2026-06-13 23:00 UTCEPSS rescore
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  71. 2026-06-10 13:22 UTCEPSS rescore
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  73. 2026-06-08 14:17 UTCEPSS rescore
  74. 2026-06-08 14:17 UTCEPSS rescore
  75. 2026-06-07 15:25 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-40265?
CVE-2026-40265 is a medium vulnerability published on April 17, 2026. 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…
When was CVE-2026-40265 disclosed?
CVE-2026-40265 was first published in the National Vulnerability Database on April 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40265 actively exploited?
CVE-2026-40265 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 63.5% of all scored CVEs.
What is the CVSS score of CVE-2026-40265?
CVE-2026-40265 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-40265?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40265, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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