CVE-2026-45501

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-06-09. the CNA's CVSS baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: 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
6.5
EG Score
6.5(high)
EPSS
22.6%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 1, 2026

Advisory Details (1)

Auto-updated Jun 12, 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-2026-45501

Vendor Advisories for CVE-2026-45501(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 24× 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 115 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 14:17 UTCEG score recompute
  8. 2026-07-04 14:17 UTCVendor advisory
  9. 2026-07-04 14:17 UTCGHSA enrichment
  10. 2026-07-04 06:31 UTCEPSS rescore
  11. 2026-07-03 15:46 UTCEG score recompute
  12. 2026-07-03 15:46 UTCVendor advisory
  13. 2026-07-03 15:46 UTCGHSA enrichment
  14. 2026-07-02 14:55 UTCEG score recompute
  15. 2026-07-02 14:55 UTCVendor advisory
  16. 2026-07-02 14:55 UTCGHSA enrichment
  17. 2026-07-01 16:22 UTCEG score recompute
  18. 2026-07-01 16:22 UTCVendor advisory
  19. 2026-07-01 16:22 UTCGHSA enrichment
  20. 2026-07-01 15:07 UTCEPSS rescore
  21. 2026-06-30 23:22 UTCEPSS rescore
  22. 2026-06-30 17:49 UTCEG score recompute
  23. 2026-06-30 17:49 UTCVendor advisory
  24. 2026-06-30 17:49 UTCGHSA enrichment
  25. 2026-06-29 19:09 UTCEG score recompute
Show 75 more
  1. 2026-06-29 19:09 UTCVendor advisory
  2. 2026-06-29 19:09 UTCGHSA enrichment
  3. 2026-06-29 14:06 UTCEPSS rescore
  4. 2026-06-29 14:06 UTCEPSS rescore
  5. 2026-06-28 19:21 UTCEG score recompute
  6. 2026-06-28 19:21 UTCVendor advisory
  7. 2026-06-28 19:21 UTCGHSA enrichment
  8. 2026-06-28 14:07 UTCEPSS rescore
  9. 2026-06-28 04:56 UTCEPSS rescore
  10. 2026-06-28 04:56 UTCEPSS rescore
  11. 2026-06-27 20:50 UTCEG score recompute
  12. 2026-06-27 20:50 UTCVendor advisory
  13. 2026-06-27 20:50 UTCGHSA enrichment
  14. 2026-06-27 03:08 UTCEPSS rescore
  15. 2026-06-26 22:18 UTCEG score recompute
  16. 2026-06-26 22:18 UTCVendor advisory
  17. 2026-06-26 22:18 UTCGHSA enrichment
  18. 2026-06-25 23:46 UTCEG score recompute
  19. 2026-06-25 23:46 UTCVendor advisory
  20. 2026-06-25 23:46 UTCGHSA enrichment
  21. 2026-06-25 13:49 UTCEPSS rescore
  22. 2026-06-25 01:14 UTCEG score recompute
  23. 2026-06-25 01:14 UTCVendor advisory
  24. 2026-06-25 01:14 UTCGHSA enrichment
  25. 2026-06-24 14:05 UTCEPSS rescore
  26. 2026-06-24 02:43 UTCEG score recompute
  27. 2026-06-24 02:43 UTCVendor advisory
  28. 2026-06-24 02:43 UTCGHSA enrichment
  29. 2026-06-23 21:33 UTCEPSS rescore
  30. 2026-06-23 21:33 UTCEPSS rescore
  31. 2026-06-23 04:10 UTCEG score recompute
  32. 2026-06-23 04:10 UTCVendor advisory
  33. 2026-06-23 04:09 UTCGHSA enrichment
  34. 2026-06-22 14:25 UTCEPSS rescore
  35. 2026-06-22 14:25 UTCEPSS rescore
  36. 2026-06-22 05:08 UTCEG score recompute
  37. 2026-06-22 05:08 UTCVendor advisory
  38. 2026-06-22 05:08 UTCGHSA enrichment
  39. 2026-06-21 14:56 UTCEPSS rescore
  40. 2026-06-21 14:56 UTCEPSS rescore
  41. 2026-06-21 01:59 UTCEPSS rescore
  42. 2026-06-21 01:46 UTCEG score recompute
  43. 2026-06-21 01:46 UTCVendor advisory
  44. 2026-06-21 01:46 UTCGHSA enrichment
  45. 2026-06-21 01:43 UTCMITRE cvelistV5CVSS v3 → 6.5
  46. 2026-06-20 02:40 UTCEG score recompute
  47. 2026-06-20 02:40 UTCVendor advisory
  48. 2026-06-20 02:39 UTCGHSA enrichment
  49. 2026-06-19 19:25 UTCEPSS rescore
  50. 2026-06-19 02:48 UTCEG score recompute
  51. 2026-06-19 02:48 UTCGHSA enrichment
  52. 2026-06-18 17:52 UTCEPSS rescore
  53. 2026-06-18 17:52 UTCEPSS rescore
  54. 2026-06-18 04:15 UTCEG score recompute
  55. 2026-06-18 04:15 UTCGHSA enrichment
  56. 2026-06-17 17:53 UTCEPSS rescore
  57. 2026-06-17 05:43 UTCEG score recompute
  58. 2026-06-17 05:43 UTCGHSA enrichment
  59. 2026-06-16 17:52 UTCEPSS rescore
  60. 2026-06-16 07:10 UTCEG score recompute
  61. 2026-06-16 07:10 UTCVendor advisory
  62. 2026-06-16 07:10 UTCGHSA enrichment
  63. 2026-06-15 19:45 UTCNVD updateCVSS v3 → 6.1
  64. 2026-06-15 17:49 UTCEPSS rescore
  65. 2026-06-15 08:39 UTCEG score recompute
  66. 2026-06-15 08:39 UTCVendor advisory
  67. 2026-06-15 08:39 UTCGHSA enrichment
  68. 2026-06-14 10:01 UTCEG score recompute
  69. 2026-06-14 10:01 UTCVendor advisory
  70. 2026-06-14 10:01 UTCGHSA enrichment
  71. 2026-06-13 23:00 UTCEPSS rescore
  72. 2026-06-13 11:29 UTCEG score recompute
  73. 2026-06-13 11:29 UTCVendor advisory
  74. 2026-06-13 11:29 UTCGHSA enrichment
  75. 2026-06-12 23:12 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-45501?
CVE-2026-45501 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-2026-45501 disclosed?
CVE-2026-45501 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-2026-45501 actively exploited?
CVE-2026-45501 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45501?
CVE-2026-45501 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-45501?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45501, 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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