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PatchSiren cyber security CVE debrief

CVE-2026-58288 Microsoft CVE debrief

CVE-2026-58288 is a high-severity vulnerability in Microsoft Edge (Chromium-based) caused by a use-after-free issue, allowing unauthorized attackers to execute code over a network. This vulnerability has a CVSS score of 8.3 and is classified as HIGH severity. Users of Microsoft Edge (Chromium-based) should apply necessary updates to prevent exploitation. The vulnerability's impact is significant as it allows code execution, which can lead to unauthorized access and data breaches. Affected users should prioritize patching to mitigate potential risks.

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), particularly those in managed environments, should apply the necessary updates to prevent exploitation of this vulnerability. IT administrators and security teams responsible for managing Microsoft Edge deployments should review the official advisory and CVE record to validate affected scope, severity, and vendor guidance. They should also ensure that Microsoft Edge (Chromium-based) is configured to automatically update and monitor for any suspicious activity.

Technical summary

The CVE-2026-58288 vulnerability is caused by a use-after-free issue in Microsoft Edge (Chromium-based), allowing an unauthorized attacker to execute code over a network. The vulnerability has a CVSS score of 8.3 and is classified as HIGH severity. Affected product deployments should be identified, and necessary updates should be applied to prevent exploitation. The technical impact includes potential code execution, which can lead to unauthorized access and data breaches.

Defensive priority

High

Recommended defensive actions

  • Apply the latest security updates for Microsoft Edge (Chromium-based)
  • Ensure that Microsoft Edge (Chromium-based) is configured to automatically update
  • Monitor Microsoft Edge (Chromium-based) for any suspicious activity
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-03T21:17:03.523Z and was last modified on 2026-07-07T05:16:54.550Z. The NVD entry is currently Analyzed. The vulnerability affects Microsoft Edge (Chromium-based) and has a CVSS score of 8.3, classified as HIGH severity. Users should verify their deployments and apply necessary updates. The CVE details are sourced from official records, but specific technical impacts and exploitability details are limited.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-58288 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-58288

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

  • CVE-2026-58288 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-58288

    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.