CVE-2026-78510

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-08. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
60%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 18, 2026

Advisory Details (1)

Auto-updated Sep 18, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

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-2026-78510

Vendor Advisories for CVE-2026-78510(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 116× in last 7d / 190× 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 190 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78510?
CVE-2026-78510 is a critical vulnerability published on September 8, 2026. Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
When was CVE-2026-78510 disclosed?
CVE-2026-78510 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78510 actively exploited?
CVE-2026-78510 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 40.2% of all scored CVEs.
What is the CVSS score of CVE-2026-78510?
CVE-2026-78510 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-78510?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78510, 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.

Dependency Blast Radius

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