Executive brief
Microsoft Exchange Server, the widely used corporate email and calendaring platform, contains a vulnerability that could allow an attacker to impersonate other users or services. By exploiting this flaw, an unauthorized individual could potentially gain access to sensitive information or perform actions on behalf of legitimate users. This poses a risk to the confidentiality of corporate communications and the overall integrity of the email environment.
Technical details
A vulnerability exists in Microsoft Exchange Server due to improper neutralization of input during web page generation, leading to cross-site scripting (XSS) and spoofing capabilities. While the primary description mentions XSS, the associated CWE-918 suggests a Server-Side Request Forgery (SSRF) component or related spoofing mechanism. An attacker with low-level privileges (PR:L) can exploit this over the network without user interaction (UI:N) to achieve high confidentiality impact. This could allow the attacker to access sensitive data or internal resources that are otherwise restricted. Microsoft has released information regarding this vulnerability via their Security Update Guide.
Affected products
- Microsoft Exchange Server
Timeline
- 2026-06-09: disclosed
- 2026-06-09: advisory