Plattform
dotnet
Komponente
microsoft-account
CVE-2026-21264 describes a cross-site scripting (XSS) vulnerability within the Microsoft Account service. This flaw allows an unauthorized attacker to perform spoofing attacks over a network, potentially compromising user credentials and sensitive information. The vulnerability affects versions of Microsoft Account prior to a patch release, and a fix is expected to be made available by Microsoft.
The impact of this XSS vulnerability is significant. An attacker could inject malicious scripts into web pages viewed by Microsoft Account users. These scripts could then steal session cookies, redirect users to phishing sites that mimic the Microsoft Account login page, or execute arbitrary code within the user's browser. Successful exploitation could lead to account takeover, data theft, and further compromise of the user's system. The ability to perform spoofing attacks amplifies the risk, as attackers can convincingly impersonate legitimate Microsoft Account services to trick users into divulging sensitive information.
CVE-2026-21264 was publicly disclosed on January 22, 2026. The CVSS score of 9.3 (CRITICAL) indicates a high probability of exploitation. Public proof-of-concept (POC) code is not currently available, but the severity of the vulnerability suggests that attackers are likely to develop and deploy exploits. Monitor security advisories and threat intelligence feeds for any indications of active exploitation campaigns.
Users who frequently access Microsoft Account services through web browsers are at risk. This includes individuals using Microsoft services for email, cloud storage, or other online activities. Users who rely on Microsoft Account for single sign-on (SSO) to other applications are also at increased risk.
disclosure
Exploit-Status
EPSS
0.04% (14% Perzentil)
CISA SSVC
CVSS-Vektor
Currently, the primary mitigation strategy is to upgrade to a patched version of Microsoft Account as soon as it becomes available. Microsoft is expected to release an update addressing this vulnerability. Until the patch is applied, consider implementing stricter content security policies (CSPs) on the Microsoft Account website to limit the execution of inline scripts and external resources. Web application firewalls (WAFs) configured to detect and block XSS payloads can also provide a layer of protection. Monitor Microsoft's security advisories and support channels for updates and further guidance.
Microsoft recommends applying the latest security updates to protect against this vulnerability. See the Microsoft security bulletin for more information and the corresponding updates.
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CVE-2026-21264 is a critical cross-site scripting (XSS) vulnerability in Microsoft Account that allows attackers to potentially perform spoofing attacks over a network due to improper input neutralization.
If you are using Microsoft Account prior to the release of a patch, you are potentially affected by this vulnerability. Monitor Microsoft's security advisories for updates.
Upgrade to the latest patched version of Microsoft Account as soon as it becomes available. Until then, exercise caution and consider enabling multi-factor authentication.
While no active exploitation has been confirmed, the vulnerability's severity and XSS nature suggest a high likelihood of exploitation. Monitor security advisories for updates.
Refer to the official Microsoft Security Response Center (MSRC) website for the latest advisory regarding CVE-2026-21264: https://msrc.microsoft.com/
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