CVE-2026-48770

MEDIUMPre-NVD 5.05.0
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 5.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1% (3rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated

Also known asEUVD-2026-39908 (ENISA EUVD)Source: ENISA EUVD

5.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.0Exploit: Public PoCExposed services: Not assessed

The CVE record names the fixed release — apply it.

Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, a local process in the same interactive Windows session can send a malformed WM_COPYDATA message to Notepad++ using the COPYDATA_FULL_CMDLINE path. The handler appears to process COPYDATASTRUCT.lpData as an unbounded NUL-terminated wchar_t* instead of enforcing COPYDATASTRUCT.cbData. This vulnerability is fixed in 8.9.6.1.

CVSS v3
5.0
EG Score
5.0MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity50% × 45%
Impact severity (EG Severity): CVSS 5.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
3rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (5.0): severity, escalated by confirmed exploitation. This CVE's 5.0 is its impact severity (EG Severity), not escalated.

EG Severity
5.0 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

The CVE record names the fixed release. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 26, 2026

Last Modified

June 29, 2026

Advisory Details (2)

Auto-updated Jun 26, 2026
Fix named in the CVE record. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

Notepad++ WM_COPYDATA COPYDATA_FULL_CMDLINE local DoS crash · Advisory · notepad-plus-plus/notepad-plus-plus · GitHub

https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-r39g-3mcw-xcg2
GitHub commit

commit f20a0888a92c (notepad-plus-plus/notepad-plus-plus)

Fix landed in notepad-plus-plus/notepad-plus-plus commit f20a0888a92c — awaiting tagged release

https://github.com/notepad-plus-plus/notepad-plus-plus/commit/f20a0888a92ce557a339b833cd9d9d8e97dc797d

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 36× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 150 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 50 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  2. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  3. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  4. 2026-10-25 14:23 UTCEG score recompute
  5. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  6. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-10-22 23:04 UTCEG score recompute
  8. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  10. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
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  12. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-10-18 03:34 UTCEG score recompute
  14. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-10-13 20:54 UTCOSV refresh
  19. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-10-12 16:00 UTCEG score recompute
  22. 2026-10-11 19:43 UTCEG score recompute
  23. 2026-10-11 16:58 UTCEG score recompute
  24. 2026-10-11 14:22 UTCEG score recompute
  25. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
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  1. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  2. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  3. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  4. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  5. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  6. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  7. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  8. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  9. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  10. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  11. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  12. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  13. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  14. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  15. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-09-23 07:48 UTCEG score recompute
  17. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-09-18 07:10 UTCEG score recompute
  20. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  23. 2026-09-12 15:33 UTCEG score recompute
  24. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  25. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  26. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  27. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  28. 2026-09-06 15:00 UTCEG score recompute
  29. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  30. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  31. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  32. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
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  34. 2026-08-30 19:20 UTCEG score recompute
  35. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  36. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  37. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  38. 2026-08-27 22:58 UTCEG score recompute
  39. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  40. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  41. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  42. 2026-08-24 12:50 UTCEG score recompute
  43. 2026-08-23 08:31 UTCEG score recompute
  44. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  45. 2026-08-22 09:24 UTCEG score recompute
  46. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  47. 2026-08-21 05:42 UTCEG score recompute
  48. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  49. 2026-08-20 06:44 UTCEG score recompute
  50. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  51. 2026-08-18 23:41 UTCEG score recompute
  52. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  53. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  54. 2026-08-17 06:11 UTCEG score recompute
  55. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  56. 2026-08-16 07:13 UTCEG score recompute
  57. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  58. 2026-08-15 08:15 UTCEG score recompute
  59. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  60. 2026-08-14 08:09 UTCEG score recompute
  61. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  62. 2026-08-13 09:10 UTCEG score recompute
  63. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  64. 2026-08-12 10:12 UTCEG score recompute
  65. 2026-08-11 11:11 UTCEG score recompute
  66. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  67. 2026-08-10 12:13 UTCEG score recompute
  68. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  69. 2026-08-09 13:14 UTCEG score recompute
  70. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  71. 2026-08-08 14:16 UTCEG score recompute
  72. 2026-08-06 16:18 UTCEG score recompute
  73. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  74. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  75. 2026-08-04 18:20 UTCEG score recompute

Publicly available exploits

(1 reference)

Public exploit code is referenced for this CVE (1 GitHub PoC). Defenders should treat patch urgency accordingly.

  • GitHub PoCatiilla/Notepad-8.9.6-PoC
    Published May 28, 2026

    Proof-of-concept scripts for three vulnerabilities in Notepad++ <= 8.9.6, patched in v8.9.6.1 (2026-05-26) CVE-2026-48770 / CVE-2026-48778 / CVE-2026-48800

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-48770?
CVE-2026-48770 is a medium-severity vulnerability; its CVE record was published on June 26, 2026. Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, a local process in the same interactive Windows session can send a malformed WMCOPYDATA message to Notepad++ using the COPYDATAFULLCMDLINE path. The handler appears to process COPYDATASTRUCT.lpData as an unbounded…
When was the CVE record for CVE-2026-48770 published?
The CVE record for CVE-2026-48770 was published on June 26, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 29, 2026; the record at its source may have been updated since.
Is CVE-2026-48770 actively exploited?
CVE-2026-48770 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-48770?
CVE-2026-48770 has a CVSS base score of 5.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-48770?
The CVE record for CVE-2026-48770 names the fix: "This vulnerability is fixed in 8.9.6.1."

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