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PatchSiren cyber security CVE debrief

CVE-2026-58290 Microsoft CVE debrief

A HIGH severity vulnerability was found in Microsoft Edge (Chromium-based) that allows an unauthorized attacker to execute code over a network. This vulnerability is caused by an access of resource using incompatible type, also known as type confusion. The vulnerability has a CVSS score of 7.5 and is classified as HIGH severity. The CVE record and NVD entry provide further details.

Vendor
Microsoft
Product
Edge Chromium
CVSS
HIGH 7.5
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 apply the necessary updates to prevent exploitation of this vulnerability. This includes updating to version 150.0.4078.49 or later. Additionally, users should monitor for any suspicious activity in Microsoft Edge (Chromium-based).

Technical summary

The CVE-2026-58290 vulnerability has a CVSS score of 7.5 and is classified as HIGH severity. It is caused by a type confusion issue in Microsoft Edge (Chromium-based). An unauthorized attacker can exploit this vulnerability to execute code over a network. The vulnerability affects Microsoft Edge (Chromium-based) and users should apply the necessary updates to prevent exploitation.

Defensive priority

High priority should be given to updating Microsoft Edge (Chromium-based) to prevent exploitation of this vulnerability. This includes updating to version 150.0.4078.49 or later and monitoring for any suspicious activity.

Recommended defensive actions

  • Apply the latest security updates for Microsoft Edge (Chromium-based)
  • Ensure that Microsoft Edge (Chromium-based) is updated to version 150.0.4078.49 or later
  • Monitor for any suspicious activity in Microsoft Edge (Chromium-based)
  • 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 2026-07-03T21:17:03.770Z and was last modified on 2026-07-07T05:16:54.797Z. The NVD entry is currently Analyzed. This information is based on the NVD entry and the CVE record. The vulnerability affects Microsoft Edge (Chromium-based) and has a CVSS score of 7.5. The severity is classified as HIGH. The CVE record and NVD entry provide further details.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-58290 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-58290

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

  • CVE-2026-58290 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-58290

    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.