CVE-2026-63527

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 a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.

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

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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
38th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 11, 2026

Last Modified

September 29, 2026

Advisory Details (1)

Auto-updated Aug 11, 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-2026-63527

Vendor Advisories for CVE-2026-63527(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 28× in last 7d / 156× 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 394 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-63527?
CVE-2026-63527 is a high vulnerability published on August 11, 2026. Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.
When was CVE-2026-63527 disclosed?
CVE-2026-63527 was first published on August 11, 2026, with the most recent update on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63527 actively exploited?
CVE-2026-63527 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63527?
CVE-2026-63527 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-2026-63527?
A fix for CVE-2026-63527 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63527 are linked in the Vendor Advisories panel on this page.

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