CVE-2026-64900

HIGHNVD 5.47.3▲
EchelonGraph scoreMEDIUM confidence

Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2026-08-11. NVD baseline CVSS 5.4; sources differ by 1.9.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

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

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

CVSS v3
5.4
EG Score
7.3(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity73% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

August 11, 2026

Last Modified

August 20, 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-2026-64900

Vendor Advisories for CVE-2026-64900(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 81× in last 7d / 131× 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 131 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64900?
CVE-2026-64900 is a high vulnerability published on August 11, 2026. Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
When was CVE-2026-64900 disclosed?
CVE-2026-64900 was first published in the National Vulnerability Database on August 11, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64900 actively exploited?
CVE-2026-64900 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 62.6% of all scored CVEs.
What is the CVSS score of CVE-2026-64900?
CVE-2026-64900 has a CVSS v3 base score of 5.4 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.3.
How do I remediate CVE-2026-64900?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64900, 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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