CVE-2026-42976

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-11. The CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan mitigationRemediate 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: 7.8Exploit: None knownExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

Missing authentication for critical function in Windows RPC API allows an authorized attacker to elevate privileges locally.

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

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)
Severity78% × 45%
The EG Score, 7.8 of 10.
Exploitation0% × 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 low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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 referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
0.3%
EPSS %ILE
20th
KEV
Not listed

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

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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

Published

August 11, 2026

Last Modified

October 8, 2026

Advisory Details (1)

Auto-updated Aug 11, 2026
Fix referenced — no release confirmed yet. Sources: microsoft.
microsoftMentions a patch (unverified)

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42976

Vendor Advisories for CVE-2026-42976(2)

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 20× in last 7d / 141× 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 411 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 311 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  2. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  3. 2026-10-08 19:13 UTCEG score recompute
  4. 2026-10-08 19:13 UTCVendor advisory
  5. 2026-10-08 19:13 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  6. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  7. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  8. 2026-10-07 05:29 UTCVendor advisory
  9. 2026-10-07 05:29 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  10. 2026-10-06 17:43 UTCEG score recompute
  11. 2026-10-06 17:43 UTCVendor advisory
  12. 2026-10-06 17:43 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  13. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  14. 2026-10-05 17:50 UTCEG score recompute
  15. 2026-10-05 17:50 UTCVendor advisory
  16. 2026-10-05 17:50 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  19. 2026-10-04 22:39 UTCVendor advisory
  20. 2026-10-04 22:39 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  21. 2026-10-04 09:08 UTCVendor advisory
  22. 2026-10-04 09:08 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  23. 2026-10-03 20:52 UTCEG score recompute
  24. 2026-10-03 20:52 UTCVendor advisory
  25. 2026-10-03 20:52 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
Show 75 more
  1. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  2. 2026-10-02 22:20 UTCEG score recompute
  3. 2026-10-02 22:20 UTCVendor advisory
  4. 2026-10-02 22:20 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  5. 2026-10-02 08:36 UTCEG score recompute
  6. 2026-10-02 08:36 UTCVendor advisory
  7. 2026-10-02 08:36 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  8. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  9. 2026-10-01 09:58 UTCVendor advisory
  10. 2026-10-01 09:58 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  11. 2026-09-30 22:09 UTCEG score recompute
  12. 2026-09-30 22:09 UTCVendor advisory
  13. 2026-09-30 22:08 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  14. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  15. 2026-09-29 23:42 UTCEG score recompute
  16. 2026-09-29 23:42 UTCVendor advisory
  17. 2026-09-29 23:41 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  18. 2026-09-29 05:10 UTCEG score recompute
  19. 2026-09-29 05:10 UTCVendor advisory
  20. 2026-09-29 05:10 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  21. 2026-09-28 13:56 UTCEG score recompute
  22. 2026-09-28 13:56 UTCVendor advisory
  23. 2026-09-28 13:56 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  24. 2026-09-28 02:13 UTCEG score recompute
  25. 2026-09-28 02:13 UTCVendor advisory
  26. 2026-09-28 02:13 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  27. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  28. 2026-09-27 10:06 UTCEG score recompute
  29. 2026-09-27 10:06 UTCVendor advisory
  30. 2026-09-27 10:06 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  31. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  32. 2026-09-25 20:11 UTCVendor advisory
  33. 2026-09-25 20:11 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  34. 2026-09-25 03:50 UTCEG score recompute
  35. 2026-09-25 03:50 UTCVendor advisory
  36. 2026-09-25 03:50 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  37. 2026-09-24 13:50 UTCVendor advisory
  38. 2026-09-24 13:50 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  39. 2026-09-24 08:48 UTCVendor advisory
  40. 2026-09-24 08:48 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  41. 2026-09-23 21:07 UTCEG score recompute
  42. 2026-09-23 21:07 UTCVendor advisory
  43. 2026-09-23 21:07 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  44. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  45. 2026-09-23 09:25 UTCVendor advisory
  46. 2026-09-23 09:25 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  47. 2026-09-22 21:44 UTCEG score recompute
  48. 2026-09-22 21:44 UTCVendor advisory
  49. 2026-09-22 21:44 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  50. 2026-09-22 10:03 UTCVendor advisory
  51. 2026-09-22 10:03 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  52. 2026-09-21 22:06 UTCEG score recompute
  53. 2026-09-21 22:06 UTCVendor advisory
  54. 2026-09-21 22:06 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  55. 2026-09-21 10:23 UTCEG score recompute
  56. 2026-09-21 10:23 UTCVendor advisory
  57. 2026-09-21 10:23 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  58. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  59. 2026-09-20 19:14 UTCVendor advisory
  60. 2026-09-20 19:14 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  61. 2026-09-20 00:02 UTCEG score recompute
  62. 2026-09-20 00:02 UTCVendor advisory
  63. 2026-09-20 00:02 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  64. 2026-09-19 12:21 UTCVendor advisory
  65. 2026-09-19 12:21 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  66. 2026-09-19 00:40 UTCEG score recompute
  67. 2026-09-19 00:40 UTCVendor advisory
  68. 2026-09-19 00:40 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  69. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  70. 2026-09-18 12:58 UTCVendor advisory
  71. 2026-09-18 12:58 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  72. 2026-09-18 00:40 UTCEG score recompute
  73. 2026-09-18 00:40 UTCVendor advisory
  74. 2026-09-18 00:40 UTCGHSA enrichmentGHSA-pwpm-f3h4-8mvh · GitHub severity HIGH · GitHub CVSS 7.8
  75. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 12th percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-42976?
CVE-2026-42976 is a high vulnerability published on August 11, 2026. Missing authentication for critical function in Windows RPC API allows an authorized attacker to elevate privileges locally.
When was the CVE record for CVE-2026-42976 published?
The CVE record for CVE-2026-42976 was published on August 11, 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 October 8, 2026; the record at its source may have been updated since.
Is CVE-2026-42976 actively exploited?
CVE-2026-42976 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (20th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-42976?
CVE-2026-42976 has a CVSS base score of 7.8 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-42976?
A fix for CVE-2026-42976 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-42976 are linked in the Vendor Advisories panel on this page.

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