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%, top 99% 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, 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%CVSS: 5.4Exploit: Elevated riskExposed: 0

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

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
5.4(medium)
EG Risk
40(Track*)
EG Risk 40/100SSVC: 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
Severity54% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
1%
KEV
Not listed

Published

August 17, 2026

Last Modified

August 17, 2026

Advisory Details (3)

Auto-updated Aug 17, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
github Patch Available🟡 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 / 16× 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. 2026-08-25 03:26 UTCEG score recompute
  2. 2026-08-23 01:45 UTCEG score recompute
  3. 2026-08-23 00:19 UTCEPSS rescore
  4. 2026-08-22 00:53 UTCEG score recompute
  5. 2026-08-21 23:49 UTCEPSS rescore
  6. 2026-08-21 00:02 UTCEG score recompute
  7. 2026-08-20 22:56 UTCEPSS rescore
  8. 2026-08-19 23:12 UTCEG score recompute
  9. 2026-08-19 17:04 UTCEPSS rescore
  10. 2026-08-18 22:21 UTCEG score recompute
  11. 2026-08-18 13:49 UTCEPSS rescore
  12. 2026-08-18 13:49 UTCEPSS rescore
  13. 2026-08-17 21:31 UTCEG score recompute
  14. 2026-08-17 20:30 UTCEG score recompute
  15. 2026-08-17 20:20 UTCEG score recompute
  16. 2026-08-17 20:19 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

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 in the National Vulnerability Database on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71858 actively exploited?
CVE-2026-71858 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 99.1% of all scored CVEs.
What is the CVSS score of CVE-2026-71858?
CVE-2026-71858 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-71858?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-71858, 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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