CVE-2026-58639

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-08-11. 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
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: 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 Office SharePoint allows an authorized attacker to perform spoofing over a network.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
30(Track)
EG Risk 30/100SSVC: 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%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
56%
KEV
Not listed

Published

August 11, 2026

Last Modified

September 16, 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-2026-58639

Vendor Advisories for CVE-2026-58639(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 / 134× 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 250 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-58639?
CVE-2026-58639 is a medium vulnerability published on August 11, 2026. Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
When was CVE-2026-58639 disclosed?
CVE-2026-58639 was first published in the National Vulnerability Database on August 11, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58639 actively exploited?
CVE-2026-58639 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 43.9% of all scored CVEs.
What is the CVSS score of CVE-2026-58639?
CVE-2026-58639 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-58639?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58639, 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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