CVE-2025-15556

HIGHNVD 7.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-02-12), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 7.5 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
7.5
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

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

Notepad++ versions prior to 8.8.9, when using the WinGUp updater, contain an update integrity verification vulnerability where downloaded update metadata and installers are not cryptographically verified. An attacker able to intercept or redirect update traffic can cause the updater to download and execute an attacker-controlled installer, resulting in arbitrary code execution with the privileges of the user.

CVSS v3
7.5
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
66.7%
KEV
⚠ Exploited

Published

February 3, 2026

Last Modified

February 13, 2026

Advisory Details (7)

Auto-updated Jun 4, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: github_commit, cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-15556
generic

Important Clarification: Notepad++ Security Incident | Notepad++

https://notepad-plus-plus.org//news//clarification-security-incident/
generic🔴 Active Exploitation

Notepad++ < 8.8.9 WinGUp Updater Lacks Update Integrity Verification | Advisories | VulnCheck

https://www.vulncheck.com/advisories/notepad-plus-plus-wingup-updater-lacks-update-integrity-verification
generic

Notepad++ Hijacked by State-Sponsored Hackers | Notepad++

https://notepad-plus-plus.org/news/hijacked-incident-info-update/
github_commit Patch Available

commit ce0037549995 (notepad-plus-plus/wingup)

Patch available: notepad-plus-plus/wingup v5.3.8 (contains commit ce0037549995)

https://github.com/notepad-plus-plus/wingup/commit/ce0037549995ed0396cc363544d14b3425614fdb
github_commit

commit bcf2aa68ef41 (notepad-plus-plus/notepad-plus-plus)

Fix landed in notepad-plus-plus/notepad-plus-plus commit bcf2aa68ef41 — awaiting tagged release

https://github.com/notepad-plus-plus/notepad-plus-plus/commit/bcf2aa68ef414338d717e20e059459570ed6c5ab
generic

Notepad++ v8.8.9: Vulnerability-fix | Notepad++ Community

https://community.notepad-plus-plus.org/topic/27298/notepad-v8-8-9-vulnerability-fix

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 64× in last 7d / 255× 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 457 total refreshes for this CVE.

  1. 2026-07-23 02:49 UTCEG score recompute
  2. 2026-07-22 21:36 UTCEG score recompute
  3. 2026-07-22 21:36 UTCGHSA enrichment
  4. 2026-07-22 19:40 UTCCISA KEV update
  5. 2026-07-22 17:51 UTCGHSA enrichment
  6. 2026-07-22 14:09 UTCEG score recompute
  7. 2026-07-22 14:09 UTCGHSA enrichment
  8. 2026-07-22 14:07 UTCEPSS rescore
  9. 2026-07-22 14:07 UTCEPSS rescore
  10. 2026-07-22 10:25 UTCGHSA enrichment
  11. 2026-07-22 06:42 UTCGHSA enrichment
  12. 2026-07-22 02:59 UTCGHSA enrichment
  13. 2026-07-21 23:16 UTCGHSA enrichment
  14. 2026-07-21 19:03 UTCEG score recompute
  15. 2026-07-21 19:03 UTCGHSA enrichment
  16. 2026-07-21 15:24 UTCEPSS rescore
  17. 2026-07-21 15:21 UTCGHSA enrichment
  18. 2026-07-21 14:37 UTCCISA KEV update
  19. 2026-07-21 11:37 UTCGHSA enrichment
  20. 2026-07-21 07:54 UTCGHSA enrichment
  21. 2026-07-21 04:10 UTCGHSA enrichment
  22. 2026-07-21 00:28 UTCGHSA enrichment
  23. 2026-07-20 20:45 UTCEG score recompute
  24. 2026-07-20 20:45 UTCGHSA enrichment
  25. 2026-07-20 17:03 UTCGHSA enrichment
Show 75 more
  1. 2026-07-20 13:19 UTCGHSA enrichment
  2. 2026-07-20 09:36 UTCGHSA enrichment
  3. 2026-07-20 05:53 UTCGHSA enrichment
  4. 2026-07-20 02:11 UTCGHSA enrichment
  5. 2026-07-19 22:28 UTCGHSA enrichment
  6. 2026-07-19 18:46 UTCGHSA enrichment
  7. 2026-07-19 15:04 UTCEG score recompute
  8. 2026-07-19 15:04 UTCGHSA enrichment
  9. 2026-07-19 14:30 UTCEPSS rescore
  10. 2026-07-19 14:30 UTCEPSS rescore
  11. 2026-07-19 11:22 UTCGHSA enrichment
  12. 2026-07-19 07:39 UTCGHSA enrichment
  13. 2026-07-19 03:56 UTCEG score recompute
  14. 2026-07-19 03:56 UTCGHSA enrichment
  15. 2026-07-19 02:28 UTCEPSS rescore
  16. 2026-07-19 02:28 UTCEPSS rescore
  17. 2026-07-19 00:13 UTCGHSA enrichment
  18. 2026-07-18 20:30 UTCGHSA enrichment
  19. 2026-07-18 16:47 UTCGHSA enrichment
  20. 2026-07-18 13:04 UTCEG score recompute
  21. 2026-07-18 13:04 UTCGHSA enrichment
  22. 2026-07-18 10:03 UTCEPSS rescore
  23. 2026-07-18 09:21 UTCGHSA enrichment
  24. 2026-07-18 05:38 UTCGHSA enrichment
  25. 2026-07-18 01:55 UTCGHSA enrichment
  26. 2026-07-17 22:12 UTCGHSA enrichment
  27. 2026-07-17 18:29 UTCGHSA enrichment
  28. 2026-07-17 14:47 UTCGHSA enrichment
  29. 2026-07-17 11:05 UTCGHSA enrichment
  30. 2026-07-17 07:22 UTCEG score recompute
  31. 2026-07-17 07:22 UTCGHSA enrichment
  32. 2026-07-17 03:40 UTCGHSA enrichment
  33. 2026-07-16 23:56 UTCGHSA enrichment
  34. 2026-07-16 20:14 UTCGHSA enrichment
  35. 2026-07-16 17:04 UTCCISA KEV update
  36. 2026-07-16 17:02 UTCEPSS rescore
  37. 2026-07-16 17:02 UTCEPSS rescore
  38. 2026-07-16 16:31 UTCGHSA enrichment
  39. 2026-07-16 12:47 UTCGHSA enrichment
  40. 2026-07-16 09:04 UTCGHSA enrichment
  41. 2026-07-16 05:21 UTCGHSA enrichment
  42. 2026-07-16 01:37 UTCGHSA enrichment
  43. 2026-07-15 21:55 UTCGHSA enrichment
  44. 2026-07-15 18:11 UTCGHSA enrichment
  45. 2026-07-15 16:57 UTCEPSS rescore
  46. 2026-07-15 16:57 UTCEPSS rescore
  47. 2026-07-15 16:49 UTCCISA KEV update
  48. 2026-07-15 15:04 UTCCISA KEV update
  49. 2026-07-15 14:28 UTCGHSA enrichment
  50. 2026-07-15 10:46 UTCGHSA enrichment
  51. 2026-07-15 07:01 UTCGHSA enrichment
  52. 2026-07-15 03:18 UTCGHSA enrichment
  53. 2026-07-15 01:59 UTCEPSS rescore
  54. 2026-07-15 01:59 UTCEPSS rescore
  55. 2026-07-14 23:36 UTCGHSA enrichment
  56. 2026-07-14 19:54 UTCGHSA enrichment
  57. 2026-07-14 18:05 UTCCISA KEV update
  58. 2026-07-14 16:11 UTCGHSA enrichment
  59. 2026-07-14 12:29 UTCGHSA enrichment
  60. 2026-07-14 08:46 UTCGHSA enrichment
  61. 2026-07-14 05:03 UTCGHSA enrichment
  62. 2026-07-14 01:21 UTCGHSA enrichment
  63. 2026-07-13 22:29 UTCEPSS rescore
  64. 2026-07-13 22:29 UTCEPSS rescore
  65. 2026-07-13 21:39 UTCGHSA enrichment
  66. 2026-07-13 17:56 UTCGHSA enrichment
  67. 2026-07-13 17:07 UTCCISA KEV update
  68. 2026-07-13 14:13 UTCGHSA enrichment
  69. 2026-07-13 10:30 UTCGHSA enrichment
  70. 2026-07-13 06:47 UTCGHSA enrichment
  71. 2026-07-13 06:12 UTCEPSS rescore
  72. 2026-07-13 03:04 UTCGHSA enrichment
  73. 2026-07-12 23:21 UTCGHSA enrichment
  74. 2026-07-12 19:38 UTCGHSA enrichment
  75. 2026-07-12 15:55 UTCGHSA enrichment

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Frequently asked(6)

What is CVE-2025-15556?
CVE-2025-15556 is a high vulnerability published on February 3, 2026. Notepad++ versions prior to 8.8.9, when using the WinGUp updater, contain an update integrity verification vulnerability where downloaded update metadata and installers are not cryptographically verified. An attacker able to intercept or redirect update traffic can cause the updater to download and…
When was CVE-2025-15556 disclosed?
CVE-2025-15556 was first published in the National Vulnerability Database on February 3, 2026, with the most recent update on February 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-15556 actively exploited?
Yes. CISA added CVE-2025-15556 to the Known Exploited Vulnerabilities catalog on February 12, 2026, affecting Notepad++ Notepad++. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2025-15556?
CVE-2025-15556 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2025-15556?
CVE-2025-15556 affects Notepad++ Notepad++. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2025-15556?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-15556, 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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