CVE-2026-70318

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-08-11. The CNA's CVSS baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100CISA 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
Severity55% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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-2026-70318

Vendor Advisories for CVE-2026-70318(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 23× in last 7d / 115× 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 297 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-70318?
CVE-2026-70318 is a medium vulnerability published on August 11, 2026. Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
When was CVE-2026-70318 disclosed?
CVE-2026-70318 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-2026-70318 actively exploited?
CVE-2026-70318 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-70318?
CVE-2026-70318 has a CVSS base score of 5.5 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-70318?
A fix for CVE-2026-70318 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-70318 are linked in the Vendor Advisories panel on this page.

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