CVE-2026-52886

MEDIUMPre-NVD 5.15.1
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (5th 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
5.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.1Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Notepad++ is a free and open-source source code editor. Prior to 8.9.7, Notepad++ validates the backupFilePath attribute from session.xml with std::wstring::starts_with against the expected backup directory without path normalization, allowing parent-directory sequences during snapshot-mode restoration to read an arbitrary user-readable file outside the backup directory into an editor tab. This issue is fixed in version 8.9.7.

CVSS v3
5.1
EG Score
5.1MEDIUMmedium confidence
EG Risk
54
EG Risk 54/100

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 (value × EchelonGraph’s weight)
Severity51% × 45%
The EG Score, 5.1 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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: 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
0.2%
EPSS %ILE
5th
KEV
Not listed

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

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 yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

August 17, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 17, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

session.xml backupFilePath starts_with Bypass · Advisory · notepad-plus-plus/notepad-plus-plus · GitHub

https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-rqfm-pw34-r7j6
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 7e66f36db666 (notepad-plus-plus/notepad-plus-plus)

Fix landed in notepad-plus-plus/notepad-plus-plus commit 7e66f36db666 — awaiting tagged release

https://github.com/notepad-plus-plus/notepad-plus-plus/commit/7e66f36db666a13b09fb5c31232ab2ca1c2ebccc

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 49× 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.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  3. 2026-10-12 15:58 UTCEG score recompute
  4. 2026-10-11 19:41 UTCEG score recompute
  5. 2026-10-11 16:56 UTCEG score recompute
  6. 2026-10-11 14:19 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  12. 2026-10-07 11:26 UTCEG score recompute
  13. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  14. 2026-10-06 12:57 UTCEG score recompute
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  16. 2026-10-05 14:33 UTCEG score recompute
  17. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  18. 2026-10-03 17:46 UTCEG score recompute
  19. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  20. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  21. 2026-10-02 06:56 UTCEG score recompute
  22. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  23. 2026-10-01 08:02 UTCEG score recompute
  24. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  25. 2026-09-30 09:58 UTCEG score recompute
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  1. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  2. 2026-09-29 04:12 UTCEG score recompute
  3. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  4. 2026-09-28 06:08 UTCEG score recompute
  5. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  6. 2026-09-27 08:05 UTCEG score recompute
  7. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  8. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  9. 2026-09-25 02:00 UTCEG score recompute
  10. 2026-09-23 20:27 UTCEG score recompute
  11. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  12. 2026-09-22 20:52 UTCEG score recompute
  13. 2026-09-21 22:48 UTCEG score recompute
  14. 2026-09-21 00:45 UTCEG score recompute
  15. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  16. 2026-09-20 02:42 UTCEG score recompute
  17. 2026-09-19 04:25 UTCEG score recompute
  18. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  19. 2026-09-18 06:22 UTCEG score recompute
  20. 2026-09-17 08:17 UTCEG score recompute
  21. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  22. 2026-09-16 10:14 UTCEG score recompute
  23. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  24. 2026-09-15 09:52 UTCEG score recompute
  25. 2026-09-14 11:48 UTCEG score recompute
  26. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  27. 2026-09-12 15:41 UTCEG score recompute
  28. 2026-09-11 17:38 UTCEG score recompute
  29. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  30. 2026-09-10 19:31 UTCEG score recompute
  31. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  32. 2026-09-09 03:38 UTCEG score recompute
  33. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  34. 2026-09-07 16:11 UTCEG score recompute
  35. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  36. 2026-09-06 15:17 UTCEG score recompute
  37. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  38. 2026-09-05 17:13 UTCEG score recompute
  39. 2026-09-04 19:04 UTCEG score recompute
  40. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  41. 2026-09-02 22:09 UTCEG score recompute
  42. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  43. 2026-09-01 21:37 UTCEG score recompute
  44. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  45. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  46. 2026-08-31 01:31 UTCEG score recompute
  47. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  48. 2026-08-30 03:28 UTCEG score recompute
  49. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  50. 2026-08-29 05:25 UTCEG score recompute
  51. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  52. 2026-08-27 21:39 UTCEG score recompute
  53. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  54. 2026-08-26 23:36 UTCEG score recompute
  55. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  56. 2026-08-26 01:32 UTCEG score recompute
  57. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  58. 2026-08-25 03:29 UTCEG score recompute
  59. 2026-08-23 07:23 UTCEG score recompute
  60. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  61. 2026-08-22 09:19 UTCEG score recompute
  62. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  63. 2026-08-21 11:15 UTCEG score recompute
  64. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  65. 2026-08-20 13:05 UTCEG score recompute
  66. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  67. 2026-08-18 16:45 UTCEG score recompute
  68. 2026-08-18 15:33 UTCEG score recompute
  69. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  70. 2026-08-17 20:20 UTCEG score recomputeFirst assessed: 5.1 MEDIUM
  71. 2026-08-17 20:19 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-52886?
CVE-2026-52886 is a medium-severity vulnerability; its CVE record was published on August 17, 2026. Notepad++ is a free and open-source source code editor. Prior to 8.9.7, Notepad++ validates the backupFilePath attribute from session.xml with std::wstring::starts_with against the expected backup directory without path normalization, allowing parent-directory sequences during snapshot-mode…
When was the CVE record for CVE-2026-52886 published?
The CVE record for CVE-2026-52886 was published on August 17, 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 September 9, 2026; the record at its source may have been updated since.
Is CVE-2026-52886 actively exploited?
CVE-2026-52886 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-52886?
CVE-2026-52886 has a CVSS base score of 5.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-52886?
A fix for CVE-2026-52886 is available: update to the fixed version the vendor names in its advisory.

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