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CVE-2026-58298 Microsoft CVE debrief

CVE-2026-58298 is a high-severity vulnerability in Microsoft Edge (Chromium-based) that allows an unauthorized attacker to perform spoofing over a network. The vulnerability has a CVSS score of 7.2 and is classified as HIGH. Microsoft Edge (Chromium-based) is affected by this vulnerability. This vulnerability is caused by improper neutralization of input during web page generation, also known as cross-site scripting (XSS). An attacker can exploit this vulnerability by sending a specially crafted request to the affected system, which can then be executed by the browser. This allows the attacker to perform spoofing over a network, potentially leading to phishing attacks or other malicious activities. Users of Microsoft Edge (Chromium-based) should be aware of this vulnerability and take necessary precautions to protect themselves.

Vendor
Microsoft
Product
Edge Chromium
CVSS
HIGH 7.2
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 vulnerability allows an attacker to perform spoofing over a network, which can lead to phishing attacks or other malicious activities.

Technical summary

The vulnerability is caused by improper neutralization of input during web page generation, also known as cross-site scripting (XSS). An attacker can exploit this vulnerability by sending a specially crafted request to the affected system, which can then be executed by the browser. This allows the attacker to perform spoofing over a network.

Defensive priority

High priority should be given to patching this vulnerability, as it allows an attacker to perform spoofing over a network. Users of Microsoft Edge (Chromium-based) should update their browser to the latest version as soon as possible.

Recommended defensive actions

  • Apply the patch provided by Microsoft to vulnerable systems.
  • Ensure that Microsoft Edge (Chromium-based) is updated to the latest version.
  • Monitor network traffic for suspicious activity.
  • Implement additional security measures, such as web application firewalls, to detect and prevent attacks.

Evidence notes

The CVE record was published on 2026-07-03T21:17:04.790Z and was last modified on 2026-07-07T14:50:40.517Z. The NVD entry is currently Analyzed. The vulnerability affects Microsoft Edge (Chromium-based) and has a CVSS score of 7.2. The CVE record was obtained from the official CVE.org website and the NVD entry is available for further information. The source item URL is also provided for additional context.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-58298 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-58298

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

  • CVE-2026-58298 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-58298

    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.