CVE-2026-58291

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2026-07-03. the CNA's CVSS baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Operation on a resource after expiration or release in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose information over a network.

CVSS v3
6.1
EG Score
6.1(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity61% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
61%
KEV
Not listed

Published

July 3, 2026

Last Modified

September 17, 2026

Advisory Details (1)

Auto-updated Jul 7, 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-2026-58291

Vendor Advisories for CVE-2026-58291(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 15× in last 7d / 78× 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 266 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-58291?
CVE-2026-58291 is a medium vulnerability published on July 3, 2026. Operation on a resource after expiration or release in Microsoft Edge (Chromium-based) allows an unauthorized attacker to disclose information over a network.
When was CVE-2026-58291 disclosed?
CVE-2026-58291 was first published in the National Vulnerability Database on July 3, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58291 actively exploited?
CVE-2026-58291 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 39.0% of all scored CVEs.
What is the CVSS score of CVE-2026-58291?
CVE-2026-58291 has a CVSS v4.0 base score of 6.1 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-58291?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58291, 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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