CVE-2026-71858

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1% (1st percentile of EPSS-scored CVEs). 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, secondary
Elevated
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.4Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Notepad++ is a free and open-source source code editor. Prior to 8.9.7, macros loaded from an attacker-controlled shortcuts.xml bypass the HMAC validation applied to UserDefinedCommands and can invoke Scintilla actions and the internal Open in Default Viewer command in an elevated Notepad++ process, allowing protected file modification and conditional elevated command execution when a local attacker influences settingsDir and a user triggers the macro. This issue is fixed in version 8.9.7.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
40
EG Risk 40/100CISA SSVC

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
Severity54% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 17, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 17, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
githubMentions a patch (unverified)🟡 PoC Available

shortcuts.xml Macro HMAC Bypass Enables Conditional Elevated Command Execution · Advisory · notepad-plus-plus/notepad-plus-plus · GitHub

https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-f4rj-vqq4-wvg4
github_release Patch Available

Notepad++ release 8.9.7

Patch available: notepad-plus-plus/notepad-plus-plus v8.9.7

https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.7
github_commit

commit 7686e5a3025e (notepad-plus-plus/notepad-plus-plus)

Fix landed in notepad-plus-plus/notepad-plus-plus commit 7686e5a3025e — awaiting tagged release

https://github.com/notepad-plus-plus/notepad-plus-plus/commit/7686e5a3025eaf1fb8e024c2ceb54670ea05f5fb

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 42× 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.

  1. 2026-10-10 20:00 UTCEPSS rescore
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  3. 2026-10-08 17:13 UTCEPSS rescore
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  5. 2026-10-07 11:26 UTCEG score recompute
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  19. 2026-09-27 13:48 UTCEPSS rescore
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  25. 2026-09-22 11:27 UTCEG score recompute
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  1. 2026-09-21 21:09 UTCEPSS rescore
  2. 2026-09-21 10:36 UTCEG score recompute
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 09:45 UTCEG score recompute
  5. 2026-09-19 06:07 UTCEG score recompute
  6. 2026-09-18 19:28 UTCEPSS rescore
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  9. 2026-09-16 14:08 UTCEPSS rescore
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  15. 2026-09-12 15:02 UTCEPSS rescore
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  17. 2026-09-11 14:53 UTCEPSS rescore
  18. 2026-09-10 22:18 UTCEG score recompute
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  21. 2026-09-08 22:01 UTCEPSS rescore
  22. 2026-09-07 16:11 UTCEG score recompute
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  24. 2026-09-06 13:48 UTCEPSS rescore
  25. 2026-09-05 14:13 UTCEG score recompute
  26. 2026-09-03 12:14 UTCEG score recompute
  27. 2026-09-02 14:12 UTCEPSS rescore
  28. 2026-09-02 11:14 UTCEG score recompute
  29. 2026-09-01 13:54 UTCEPSS rescore
  30. 2026-09-01 10:24 UTCEG score recompute
  31. 2026-09-01 04:40 UTCEPSS rescore
  32. 2026-08-31 09:31 UTCEG score recompute
  33. 2026-08-30 19:17 UTCEPSS rescore
  34. 2026-08-30 07:53 UTCEG score recompute
  35. 2026-08-30 01:22 UTCEPSS rescore
  36. 2026-08-29 06:56 UTCEG score recompute
  37. 2026-08-28 21:42 UTCEPSS rescore
  38. 2026-08-28 06:05 UTCEG score recompute
  39. 2026-08-27 05:10 UTCEG score recompute
  40. 2026-08-26 14:47 UTCEPSS rescore
  41. 2026-08-25 03:26 UTCEG score recompute
  42. 2026-08-23 01:45 UTCEG score recompute
  43. 2026-08-23 00:19 UTCEPSS rescore
  44. 2026-08-22 00:53 UTCEG score recompute
  45. 2026-08-21 23:49 UTCEPSS rescore
  46. 2026-08-21 00:02 UTCEG score recompute
  47. 2026-08-20 22:56 UTCEPSS rescore
  48. 2026-08-19 23:12 UTCEG score recompute
  49. 2026-08-19 17:04 UTCEPSS rescore
  50. 2026-08-18 22:21 UTCEG score recompute
  51. 2026-08-18 13:49 UTCEPSS rescore
  52. 2026-08-18 13:49 UTCEPSS rescore
  53. 2026-08-17 21:31 UTCEG score recompute
  54. 2026-08-17 20:30 UTCEG score recompute
  55. 2026-08-17 20:20 UTCEG score recompute
  56. 2026-08-17 20:19 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-71858?
CVE-2026-71858 is a medium vulnerability published on August 17, 2026. Notepad++ is a free and open-source source code editor. Prior to 8.9.7, macros loaded from an attacker-controlled shortcuts.xml bypass the HMAC validation applied to UserDefinedCommands and can invoke Scintilla actions and the internal Open in Default Viewer command in an elevated Notepad++…
When was CVE-2026-71858 disclosed?
CVE-2026-71858 was first published on August 17, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71858 actively exploited?
CVE-2026-71858 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-71858?
CVE-2026-71858 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-71858?
A fix for CVE-2026-71858 is available: update to the fixed version the vendor names in its advisory.

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