CVE-2026-65813

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.9% (59th percentile of EPSS-scored CVEs). GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.9%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA SSVC

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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.9%
EPSS %ILE
59th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 11, 2026

Last Modified

September 29, 2026

Advisory Details (1)

Auto-updated Aug 11, 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-2026-65813

Vendor Advisories for CVE-2026-65813(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 28× in last 7d / 145× 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 361 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-65813?
CVE-2026-65813 is a high vulnerability published on August 11, 2026. Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
When was CVE-2026-65813 disclosed?
CVE-2026-65813 was first published on August 11, 2026, with the most recent update on September 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-65813 actively exploited?
CVE-2026-65813 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.9% probability of exploitation in the next 30 days (59th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-65813?
CVE-2026-65813 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-65813?
A fix for CVE-2026-65813 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-65813 are linked in the Vendor Advisories panel on this page.

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