CVE-2026-58291

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreHIGH 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(high)
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
45%
KEV
Not listed

Published

July 3, 2026

Last Modified

July 26, 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 20× in last 7d / 81× 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.

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

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 July 26, 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 55.5% 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

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

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