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 — 5 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
23%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 23, 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 13× in last 7d / 71× 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 129 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 July 23, 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 76.9% 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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