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: 1.0%CVSS: 6.1Exploit: None knownExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

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
6.1MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100CISA 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
Severity61% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
1.0%
EPSS %ILE
61st
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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

July 3, 2026

Last Modified

October 8, 2026

Advisory Details (1)

Auto-updated Jul 7, 2026
Fix referenced — no release confirmed yet. Sources: microsoft.
microsoftMentions a patch (unverified)

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 10× in last 7d / 43× 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 292 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 on July 3, 2026, with the most recent update on October 8, 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 1.0% probability of exploitation in the next 30 days (61st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-58291?
CVE-2026-58291 has a CVSS base score of 6.1 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-58291?
A fix for CVE-2026-58291 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-58291 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-58291

Explore →

Is Your Infrastructure Affected by CVE-2026-58291?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs