CVE-2026-70306

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreHIGH confidence

Score 9.3 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-11. the CNA's CVSS baseline 9.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.3Exploit: 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 unauthorized attacker to perform spoofing over a network.

CVSS v3
9.3
EG Score
9.3(high)
EG Risk
42(Track)
EG Risk 42/100SSVC: 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
Severity93% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
52%
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-2026-70306

Vendor Advisories for CVE-2026-70306(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 146× in last 7d / 207× 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 207 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-70306?
CVE-2026-70306 is a critical vulnerability published on August 11, 2026. Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
When was CVE-2026-70306 disclosed?
CVE-2026-70306 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-2026-70306 actively exploited?
CVE-2026-70306 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 48.4% of all scored CVEs.
What is the CVSS score of CVE-2026-70306?
CVE-2026-70306 has a CVSS v4.0 base score of 9.3 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-70306?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-70306, 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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