CVE-2026-63513

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.

Heap-based buffer overflow in Microsoft Office 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-2026-63513

Vendor Advisories for CVE-2026-63513(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 30× in last 7d / 143× 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 365 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-63513?
CVE-2026-63513 is a high vulnerability published on August 11, 2026. Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
When was CVE-2026-63513 disclosed?
CVE-2026-63513 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-2026-63513 actively exploited?
CVE-2026-63513 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-2026-63513?
CVE-2026-63513 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-2026-63513?
A fix for CVE-2026-63513 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63513 are linked in the Vendor Advisories panel on this page.

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