CVE-2026-55023

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-07-14. 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: 1%CVSS: 5.5Exploit: None knownExposed: 0

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

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

July 14, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Jul 16, 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-2026-55023

Vendor Advisories for CVE-2026-55023(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 29× in last 7d / 130× 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 185 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-55023?
CVE-2026-55023 is a medium vulnerability published on July 14, 2026. Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
When was CVE-2026-55023 disclosed?
CVE-2026-55023 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55023 actively exploited?
CVE-2026-55023 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 54.2% of all scored CVEs.
What is the CVSS score of CVE-2026-55023?
CVE-2026-55023 has a CVSS v4.0 base score of 5.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-55023?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55023, 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

Explore the affected products and dependency analysis for CVE-2026-55023

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