CVE-2026-58616

MEDIUMNVD 3.04.4
EchelonGraph scoreMEDIUM confidence

“▲” beside the score: it is higher than NVD's CVSS score.

Score 4.4 from GitHub Security Advisory published 2026-08-28. NVD baseline CVSS 3.0; sources differ by 1.4.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week
4.4EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 3.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Concurrent execution using shared resource with improper synchronization ('race condition') in Copilot Chat (Microsoft Edge) allows an authorized attacker to disclose information over a network.

CVSS v3
3.0
EG Score
4.4MEDIUMmedium confidence
EG Risk
20
EG Risk 20/100

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 (value × EchelonGraph’s weight)
Severity44% × 45%
The EG Score, 4.4 of 10.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
20th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 28, 2026

Last Modified

October 8, 2026

Advisory Details (1)

Auto-updated Aug 28, 2026
Patch available. Sources: microsoft.
MicrosoftMentions a patch (unverified)

Security Update Guide - Microsoft Security Response Center

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58616

Vendor Advisories for CVE-2026-58616(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 20× in last 7d / 110× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 185 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 85 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  3. 2026-10-12 15:53 UTCEG score recompute
  4. 2026-10-11 19:36 UTCEG score recompute
  5. 2026-10-11 16:51 UTCEG score recompute
  6. 2026-10-11 14:14 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  9. 2026-10-10 00:50 UTCEG score recompute
  10. 2026-10-10 00:50 UTCVendor advisory
  11. 2026-10-10 00:50 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  13. 2026-10-08 18:20 UTCEG score recompute
  14. 2026-10-08 18:20 UTCVendor advisory
  15. 2026-10-08 18:20 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  16. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  17. 2026-10-08 00:51 UTCEG score recompute
  18. 2026-10-08 00:51 UTCVendor advisory
  19. 2026-10-08 00:51 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  20. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  21. 2026-10-07 01:05 UTCEG score recompute
  22. 2026-10-07 01:05 UTCVendor advisory
  23. 2026-10-07 01:05 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  24. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  25. 2026-10-06 00:56 UTCEG score recompute
Show 75 more
  1. 2026-10-06 00:56 UTCVendor advisory
  2. 2026-10-06 00:56 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  3. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  4. 2026-10-05 01:20 UTCEG score recompute
  5. 2026-10-05 01:20 UTCVendor advisory
  6. 2026-10-05 01:20 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  7. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  8. 2026-10-04 01:13 UTCEG score recompute
  9. 2026-10-04 01:13 UTCVendor advisory
  10. 2026-10-04 01:13 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  11. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  12. 2026-10-03 00:28 UTCEG score recompute
  13. 2026-10-03 00:28 UTCVendor advisory
  14. 2026-10-03 00:28 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  15. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  16. 2026-10-02 00:37 UTCEG score recompute
  17. 2026-10-02 00:37 UTCVendor advisory
  18. 2026-10-02 00:37 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  19. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  20. 2026-10-01 00:59 UTCEG score recompute
  21. 2026-10-01 00:59 UTCVendor advisory
  22. 2026-10-01 00:59 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  23. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  24. 2026-09-29 23:37 UTCEG score recompute
  25. 2026-09-29 23:37 UTCVendor advisory
  26. 2026-09-29 23:37 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  27. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  28. 2026-09-28 21:08 UTCEG score recompute
  29. 2026-09-28 21:08 UTCVendor advisory
  30. 2026-09-28 21:08 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  31. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  32. 2026-09-27 18:59 UTCEG score recompute
  33. 2026-09-27 18:59 UTCVendor advisory
  34. 2026-09-27 18:59 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  35. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  36. 2026-09-26 19:23 UTCEG score recompute
  37. 2026-09-26 19:23 UTCVendor advisory
  38. 2026-09-26 19:23 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  39. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  40. 2026-09-25 19:47 UTCVendor advisory
  41. 2026-09-25 19:47 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  42. 2026-09-25 13:36 UTCEG score recompute
  43. 2026-09-25 13:36 UTCVendor advisory
  44. 2026-09-25 13:35 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  45. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  46. 2026-09-24 13:49 UTCVendor advisory
  47. 2026-09-24 13:49 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  48. 2026-09-23 19:52 UTCEG score recompute
  49. 2026-09-23 19:52 UTCVendor advisory
  50. 2026-09-23 19:52 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  51. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  52. 2026-09-22 19:56 UTCEG score recompute
  53. 2026-09-22 19:56 UTCVendor advisory
  54. 2026-09-22 19:56 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  55. 2026-09-21 20:17 UTCVendor advisory
  56. 2026-09-21 20:17 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  57. 2026-09-20 20:42 UTCEG score recompute
  58. 2026-09-20 20:42 UTCVendor advisory
  59. 2026-09-20 20:42 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  60. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  61. 2026-09-19 21:05 UTCEG score recompute
  62. 2026-09-19 21:05 UTCVendor advisory
  63. 2026-09-19 21:05 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  64. 2026-09-18 21:28 UTCEG score recompute
  65. 2026-09-18 21:28 UTCVendor advisory
  66. 2026-09-18 21:28 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  67. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  68. 2026-09-17 20:50 UTCEG score recompute
  69. 2026-09-17 20:50 UTCVendor advisory
  70. 2026-09-17 20:50 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  71. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 12th percentile
  72. 2026-09-16 16:57 UTCEG score recompute
  73. 2026-09-16 16:57 UTCVendor advisory
  74. 2026-09-16 16:57 UTCGHSA enrichmentGHSA-c7hh-86mm-w7m5 · GitHub CVSS 4.4
  75. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 12th percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-58616?
CVE-2026-58616 is a medium-severity vulnerability; its CVE record was published on August 28, 2026. Concurrent execution using shared resource with improper synchronization ('race condition') in Copilot Chat (Microsoft Edge) allows an authorized attacker to disclose information over a network.
When was CVE-2026-58616 made public?
CVE-2026-58616 was made public on August 28, 2026: that is the date its CVE record's CNA, Microsoft Corporation, gives for when the vulnerability was made public. The CVE record itself was published on August 28, 2026. EchelonGraph's copy of the record carries a last-modified date of October 8, 2026; the record at its source may have been updated since.
Is CVE-2026-58616 actively exploited?
CVE-2026-58616 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (20th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-58616?
CVE-2026-58616 has a CVSS v3 base score of 3.0 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 4.4 (MEDIUM).
How do I remediate CVE-2026-58616?
A fix for CVE-2026-58616 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-58616 are linked in the Vendor Advisories panel on this page.

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