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PatchSiren cyber security CVE debrief

CVE-2026-62904 Microsoft CVE debrief

Microsoft Edge (Chromium-based) contains a vulnerability that allows unauthorized information disclosure over a network due to incorrect authorization. This medium-severity vulnerability, classified as CWE-863, has a CVSS score of 5.4. Edge Chromium users and administrators should assess their deployment for potential exposure and verify available patches or updates. The CVE record and NVD entry provide details on the vulnerability, but additional information on affected versions and exploitation requires verification from official sources.

Vendor
Microsoft
Product
Microsoft Edge (Chromium-based)
CVSS
MEDIUM 5.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-28
Original CVE updated
2026-09-11
Advisory published
2026-08-28
Advisory updated
2026-09-11

Who should care

Edge Chromium users and administrators should assess their deployment for potential exposure and verify available patches or updates. This includes reviewing and applying Microsoft's advisory for CVE-2026-62904, assessing Edge Chromium deployment for potential exposure, and verifying and applying available patches or updates. Additionally, they should verify Edge Chromium version and apply patches or updates to and

Why it matters

CVE-2026-62904 is a medium-severity vulnerability in Microsoft Edge (Chromium-based) that allows unauthorized information disclosure. Edge Chromium users and administrators should assess their deployment for potential exposure and verify available patches or updates. The vulnerability has a CVSS score of 5.4 and is classified as CWE-863. Additional information on affected versions and exploitation requires verification from official sources.

  • Verify Edge Chromium version and apply patches or updates to prevent potential information disclosure
  • Assess network exposure and implement compensating controls if necessary

Technical summary

CVE-2026-62904 is a medium-severity vulnerability in Microsoft Edge (Chromium-based) that allows unauthorized information disclosure due to incorrect authorization. The vulnerability has a CVSS score of 5.4 and is classified as CWE-863. Affected Edge Chromium users and administrators should assess their deployment for potential exposure and verify available patches or updates to prevent potential information disclosure.

Defensive priority

Medium-priority assessment and remediation recommended for Edge Chromium users.

Recommended defensive actions

  • Review and apply Microsoft's advisory for CVE-2026-62904
  • Assess Edge Chromium deployment for potential exposure
  • Verify and apply available patches or updates

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. However, additional information on affected versions and exploitation requires verification from official sources.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-62904 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-62904

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

  • CVE-2026-62904 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-62904

    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.