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PatchSiren cyber security CVE debrief

CVE-2026-77490 Microsoft CVE debrief

CVE-2026-77490 is a medium-severity cross-site scripting vulnerability in Microsoft Edge (Chromium-based). An unauthorized attacker could exploit this vulnerability to perform spoofing over a network. The vulnerability is caused by improper neutralization of input during web page generation. Defenders responsible for Chromium-based Microsoft Edge deployments should assess exposure and potential impact. This vulnerability has a CVSS score of 6.1 and a medium severity rating. The CVE record and NVD entry provide limited information about the vulnerability.

Vendor
Microsoft
Product
Microsoft Edge (Chromium-based)
CVSS
MEDIUM 6.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-11
Original CVE updated
2026-09-11
Advisory published
2026-09-11
Advisory updated
2026-09-11

Who should care

Defenders responsible for Chromium-based Microsoft Edge deployments should assess exposure and potential impact. This includes verifying exposure of Chromium-based Microsoft Edge deployments, assessing potential impact on the organization, and monitoring for potential spoofing attempts. Security teams and vulnerability management teams should prioritize verifying exposure and assessing potential impact on Chromium-

Why it matters

CVE-2026-77490 is a medium-severity cross-site scripting vulnerability in Microsoft Edge (Chromium-based). Defenders should prioritize verifying exposure and assessing potential impact on Chromium-based Microsoft Edge deployments.

  • Verify exposure of Chromium-based Microsoft Edge deployments
  • Assess potential impact on organization
  • Monitor for potential spoofing attempts

Technical summary

The vulnerability is caused by improper neutralization of input during web page generation in Microsoft Edge (Chromium-based). An unauthorized attacker could exploit this vulnerability to perform spoofing over a network. The vulnerability has a CVSS score of 6.1 and a medium severity rating. The CVE record and NVD entry provide limited information about the vulnerability. Further verification is needed to determine affected versions and potential impact.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact on Chromium-based Microsoft Edge deployments.

Recommended defensive actions

  • Verify Chromium-based Microsoft Edge deployments for exposure
  • Assess potential impact on organization
  • Monitor for potential spoofing attempts

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability. Further verification is needed to determine affected versions and potential impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-77490 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-77490

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

  • CVE-2026-77490 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-77490

    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.