CVE-2026-45500

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreHIGH confidence

Score 6.1 from GitHub Security Advisory published 2026-06-09. the CNA's CVSS baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
6.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.1Exploit: NoneExposed: 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 Exchange Server allows an unauthorized attacker to perform spoofing over a network.

CVSS v3
6.1
EG Score
6.1(high)
EPSS
29.5%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 1, 2026

Advisory Details (1)

Auto-updated Jun 13, 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-2026-45500

Vendor Advisories for CVE-2026-45500(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 24× in last 7d / 111× 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 111 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-45500?
CVE-2026-45500 is a medium vulnerability published on June 9, 2026. Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
When was CVE-2026-45500 disclosed?
CVE-2026-45500 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on July 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45500 actively exploited?
CVE-2026-45500 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45500?
CVE-2026-45500 has a CVSS v4.0 base score of 6.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-45500?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45500, 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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