PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-56646 Microsoft CVE debrief

CVE-2026-56646 is a MEDIUM 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 6.5 and was published on 2026-07-03T21:17:00.783Z. This vulnerability is caused by the exposure of sensitive information to an unauthorized actor in Microsoft Edge (Chromium-based). The vulnerability allows an unauthorized attacker to perform spoofing over a network. 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
MEDIUM 6.5
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) and their security teams should be aware of this vulnerability and take necessary precautions to protect themselves. This includes reviewing system configurations, applying patches, and monitoring for suspicious activity. Additionally, operators and administrators of affected systems should prioritize patching and review compensating controls.

Technical summary

The vulnerability is caused by exposure of sensitive information to an unauthorized actor in Microsoft Edge (Chromium-based). This allows an unauthorized attacker to perform spoofing over a network. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N. The vulnerability affects Microsoft Edge (Chromium-based) and has a CVSS score of 6.5.

Defensive priority

Medium priority

Recommended defensive actions

  • Apply the latest security updates for Microsoft Edge (Chromium-based)
  • Monitor for suspicious activity
  • Use a web application firewall
  • Review system configurations and apply patches
  • Verify system exposure and prioritize patching

Evidence notes

The CVE record was published on 2026-07-03T21:17:00.783Z and was last modified on 2026-07-07T13:44:42.013Z. 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 6.5. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N. Users should verify their systems and apply patches as necessary.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-56646 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-56646

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

  • CVE-2026-56646 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-56646

    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.