CVE-2026-4638

HIGHPre-NVD 7.17.1
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (23rd 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

Also known asEUVD-2026-85847 (ENISA EUVD) · GHSA-gh9q-9rjg-9rq2 (GitHub Security Advisories)Source: ENISA EUVD

7.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.1Exploit: None knownExposed services: Not assessed

Upgrade to Paessler PRTG Network Monitor version 26.2.120.1449 or later (from the CVE record's solution, SEC Consult Vulnerability Lab) — apply it.

PRTG Network Monitor before version 26.2.120.1449 ships a demo EXE/Script sensor that multiplies two integer parameters using cscript.exe. If a non-numeric value is passed instead, cscript.exe raises a 'Type mismatch' runtime error that includes the offending parameter value in plaintext. PRTG provides a documented placeholder variable, %windowspassword, which resolves to the configured Windows/domain password used by PRTG and can be passed as a sensor parameter. 

Any PRTG user who is not restricted to read-only access and is permitted to create sensors (the default for non-read-only users) can pass %windowspassword as an argument to the demo VBScript sensor, triggering the type-mismatch error and causing PRTG to display the plaintext password in the sensor's error output.

CVSS
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
32
EG Risk 32/100

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)
Severity71% × 45%
Impact severity (EG Severity): CVSS 7.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (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: Upgrade to Paessler PRTG Network Monitor version 26.2.120.1449 or later (from the CVE record's solution, SEC Consult Vulnerability Lab). Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
23rd
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 (7.1): severity, escalated by confirmed exploitation. This CVE's 7.1 is its impact severity (EG Severity), not escalated.

EG Severity
7.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-06). 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 every mission impact level.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, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

Upgrade to Paessler PRTG Network Monitor version 26.2.120.1449 or later (from the CVE record's solution, SEC Consult Vulnerability Lab). Apply it within your standard update timelines.

Exploitation none (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.

The score's inputs: 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

September 24, 2026

Last Modified

September 24, 2026

Advisory Details (3)

Auto-updated Sep 24, 2026
Fix named in the CVE record's solution (SEC Consult Vulnerability Lab).
Web page

PRTG Network Monitor – All-in-one network monitoring tool

https://www.paessler.com/prtg/prtg-network-monitor
Web page

Vulnerabilities in PRTG prior v26.2.120.1449 | Paessler Knowledge Base

https://paessler.freshdesk.com/en/support/solutions/articles/76000088640
Web page

SEC Consult - a leading consultant in application and cybersecurity as well as IT security

https://r.sec-consult.com/paessler

Vendor Advisories for CVE-2026-4638(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 34× 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 its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS → 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 122 rows 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 22 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  2. 2026-11-11 16:39 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  3. 2026-11-10 16:44 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  4. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  5. 2026-11-08 16:39 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  6. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  7. 2026-11-07 05:47 UTCEchelonGraph re-scored
  8. 2026-11-07 05:47 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  9. 2026-11-06 16:38 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  10. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  11. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  12. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  13. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  14. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  15. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  16. 2026-10-31 08:19 UTCEchelonGraph re-scored
  17. 2026-10-31 08:19 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  18. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  19. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  20. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  21. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  22. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  23. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  24. 2026-10-25 14:25 UTCEchelonGraph re-scored
  25. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
Show 75 more
  1. 2026-10-24 10:51 UTCEchelonGraph re-scored
  2. 2026-10-24 10:51 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  3. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  4. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  5. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  6. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  7. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  8. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  9. 2026-10-18 03:37 UTCEchelonGraph re-scored
  10. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  11. 2026-10-17 13:23 UTCEchelonGraph re-scored
  12. 2026-10-17 13:22 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  13. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  14. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  15. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  16. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  17. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  18. 2026-10-12 16:03 UTCEchelonGraph re-scored
  19. 2026-10-12 01:33 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  20. 2026-10-11 19:45 UTCEchelonGraph re-scored
  21. 2026-10-11 17:00 UTCEchelonGraph re-scored
  22. 2026-10-11 14:25 UTCEchelonGraph re-scored
  23. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  24. 2026-10-11 12:36 UTCEchelonGraph re-scored
  25. 2026-10-11 12:36 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  26. 2026-10-11 01:28 UTCEchelonGraph re-scored
  27. 2026-10-11 01:28 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  28. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  29. 2026-10-10 13:58 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  30. 2026-10-10 02:58 UTCEchelonGraph re-scored
  31. 2026-10-10 02:58 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  32. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  33. 2026-10-09 15:58 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  34. 2026-10-09 04:55 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  35. 2026-10-08 17:54 UTCEchelonGraph re-scored
  36. 2026-10-08 17:54 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  37. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  38. 2026-10-08 06:42 UTCEchelonGraph re-scored
  39. 2026-10-08 06:42 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  40. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  41. 2026-10-07 19:41 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  42. 2026-10-07 08:40 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  43. 2026-10-06 21:39 UTCEchelonGraph re-scored
  44. 2026-10-06 21:39 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  45. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  46. 2026-10-06 10:38 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  47. 2026-10-05 23:31 UTCEchelonGraph re-scored
  48. 2026-10-05 23:31 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  49. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  50. 2026-10-05 12:24 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  51. 2026-10-05 01:23 UTCEchelonGraph re-scored
  52. 2026-10-05 01:23 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  53. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  54. 2026-10-04 14:22 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  55. 2026-10-04 03:13 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  56. 2026-10-03 16:13 UTCEchelonGraph re-scored
  57. 2026-10-03 16:13 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  58. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  59. 2026-10-03 05:13 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  60. 2026-10-02 18:12 UTCEchelonGraph re-scored
  61. 2026-10-02 18:12 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  62. 2026-10-02 07:08 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  63. 2026-10-01 20:08 UTCEchelonGraph re-scored
  64. 2026-10-01 20:08 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  65. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  66. 2026-10-01 09:04 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  67. 2026-09-30 22:03 UTCEchelonGraph re-scored
  68. 2026-09-30 22:03 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  69. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  70. 2026-09-30 11:03 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  71. 2026-09-30 00:02 UTCEchelonGraph re-scored
  72. 2026-09-30 00:01 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  73. 2026-09-29 11:23 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH
  74. 2026-09-29 00:21 UTCEchelonGraph re-scored
  75. 2026-09-29 00:21 UTCGHSA enrichmentGHSA-gh9q-9rjg-9rq2 · GitHub severity HIGH

Frequently asked(5)

What is CVE-2026-4638?
CVE-2026-4638 is a high-severity vulnerability; its CVE record was published on September 24, 2026. PRTG Network Monitor before version 26.2.120.1449 ships a demo EXE/Script sensor that multiplies two integer parameters using cscript.exe. If a non-numeric value is passed instead, cscript.exe raises a 'Type mismatch' runtime error that includes the offending parameter value in plaintext. PRTG…
When was the CVE record for CVE-2026-4638 published?
The CVE record for CVE-2026-4638 was published on September 24, 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 24, 2026; the record at its source may have been updated since.
Is CVE-2026-4638 actively exploited?
CVE-2026-4638 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (23rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-4638?
CVE-2026-4638 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-4638?
The CVE record's solution for CVE-2026-4638, written by its CNA SEC Consult Vulnerability Lab, names the fix: "Upgrade to Paessler PRTG Network Monitor version 26.2.120.1449 or later." The vendor advisories EchelonGraph has for CVE-2026-4638 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-4638

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