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CVE-2026-58284 Microsoft CVE debrief

CVE-2026-58284 is an improper authorization vulnerability in Microsoft Edge (Chromium-based) that allows an unauthorized attacker to execute code over a network. The vulnerability has a CVSS score of 8.3 and is classified as HIGH severity. This type of vulnerability can allow attackers to bypass security mechanisms and execute malicious code remotely. Users of Microsoft Edge (Chromium-based) should be aware of this vulnerability and take necessary precautions to protect themselves.

Vendor
Microsoft
Product
Microsoft Edge (Chromium-based)
CVSS
HIGH 8.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-03
Original CVE updated
2026-07-07
Advisory published
2026-07-03
Advisory updated
2026-07-07

Who should care

Users of Microsoft Edge (Chromium-based) should be aware of this vulnerability and take necessary precautions to protect themselves. This includes ensuring that Microsoft Edge (Chromium-based) is updated to the latest version and monitoring for any suspicious activity. Additionally, security teams should review the CVE record and vendor guidance to understand the affected scope and severity.

Technical summary

The vulnerability is caused by improper authorization in Microsoft Edge (Chromium-based), allowing an unauthorized attacker to execute code over a network. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H. This vulnerability affects Microsoft Edge (Chromium-based) and can be exploited remotely.

Defensive priority

High priority should be given to patching this vulnerability, as it allows code execution over a network.

Recommended defensive actions

  • Apply the patch provided by Microsoft
  • Ensure that Microsoft Edge (Chromium-based) is updated to the latest version
  • Monitor for any suspicious activity
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-03T21:17:03.057Z and was last modified on 2026-07-07T05:16:54.207Z. The NVD entry is currently Analyzed. The vulnerability has a CVSS score of 8.3 and is classified as HIGH severity. Users should verify their systems and apply patches as necessary. The CVE record provides additional details on the vulnerability, including its CVSS vector.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-58284 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-58284

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-58284 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-58284

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.