CVE-2026-45504

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-09. the CNA's CVSS baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this weekElevated
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

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

Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

CVSS v3
8.8
EG Score
8.8(high)
EPSS
37.1%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 1, 2026

Advisory Details (1)

Auto-updated Jun 9, 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-2026-45504

Vendor Advisories for CVE-2026-45504(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 39× in last 7d / 192× 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 192 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoChawktrace/CVE-2026-45504
    First seen Jun 24, 2026

    CVE-2026-45504 Microsoft Exchange File Read

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-45504?
CVE-2026-45504 is a high vulnerability published on June 9, 2026. Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
When was CVE-2026-45504 disclosed?
CVE-2026-45504 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-2026-45504 actively exploited?
CVE-2026-45504 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 37.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45504?
CVE-2026-45504 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-45504?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45504, 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-2026-45504

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