CVE-2026-45501

MEDIUMNVD 6.16.5▲
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-06-09. NVD baseline CVSS 6.1; sources differ by 0.4.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: None knownExposed: 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 perform spoofing over a network.

CVSS v3
6.1
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

June 9, 2026

Last Modified

August 25, 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 9× in last 7d / 48× 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 258 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-45501?
CVE-2026-45501 is a medium vulnerability published on June 9, 2026. Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized 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 August 25, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 76.5% of all scored CVEs.
What is the CVSS score of CVE-2026-45501?
CVE-2026-45501 has a CVSS v3 base score of 6.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.5.
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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