CVE-2026-77490

Microsoft Edge (Chromium-based) Spoofing Vulnerability

Published Sep 11, 2026 CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Description
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.

Analysis

AI-generated

Technical impact

The vulnerability is an improper neutralization of user‑provided input during web page generation, which is a classic cross‑site scripting weakness. An attacker can exploit this flaw to inject malicious scripts that cause a web page or application to appear as though it originates from a other sensitive information. The vulnerability does not provide direct code execution or arbitrary data access; its primary impact is graphical or content spoofing via injected malicious content.

Affected Systems

Microsoft Edge (Chromium‑based) is the affected product. The CVE does not specify any particular release or build numbers, so all versions of the Chromium‑based Edge browser are potentially vulnerable until a patch is applied.

Risk and Exploitability

The CVSS score of 6.1 places this bug EPSS score is less than 1%, indicating a low probability of page content, the risk is higher in environments where internal networks allow users to view untrusted web content. The vulnerability is not currently listed in the CISA KEV catalog, suggesting no widespread, actively exploited instances have been reported yet, but the existence of the flaw warrants immediate remediation to prevent potential spoofing incidents.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade Microsoft Edge to the latest patched version as issued by Microsoft.
  • Configure enterprise group policy or browser security settings to monitor or block the loading of untrusted web content that could contain malicious injections.
  • Enable logging and monitoring for content injection events or unusual page rendering behaviors to detect and respond to any attempted spoofing.

Generated by OpenCVE AI on September 21, 2026 at 03:17 UTC.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.
Title Microsoft Edge (Chromium-based) Spoofing Vulnerability
First Time appeared Microsoft
Microsoft edge Chromium
Weaknesses CWE-79
CPEs cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft edge Chromium
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C'}

Weaknesses
  • CWE-79

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Nov 10, 2026, 9:29 PM
Reserved
Aug 20, 2026, 8:11 PM
Status
Analyzed
Published
Sep 11, 2026, 8:18 PM
Modified
Sep 25, 2026, 8:41 PM