Description

Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-08-11T17:19:00.847Z",
  "pubdate": "2026-08-11T17:19:00.847Z",
  "executiveSummary": "This vulnerability involves a Server-Side Request Forgery (SSRF) flaw residing within Microsoft Exchange Server.\nThe security defect allows an authenticated attacker to execute unauthorized actions, resulting in a privilege escalation over the network.\nThe primary impact of successful exploitation includes unauthorized access to backend resources and elevated privileges within the targeted deployment.\nThe affected product is Microsoft Exchange Server, and the risk implications are severe due to the potential compromise of internal network boundaries and sensitive application functionality.\nExploitation requires the attacker to be authorized within the network environment and capable of sending specially crafted requests to the vulnerable Exchange Server component.\nThe attack vector is network-based, leveraging the server's ability to initiate outbound or internal HTTP requests on behalf of the user to interact with unintended endpoints.",
  "technicalDetails": "The vulnerability is classified as a Server-Side Request Forgery (SSRF) flaw within Microsoft Exchange Server.\nThe root cause stems from insufficient validation and sanitization of user-supplied URLs or input parameters processed by the server-side application logic when initiating backend HTTP requests.\nAuthentication requirements dictate that the attacker must possess valid credentials and a baseline level of authorization to interact with the vulnerable Exchange interface over the network.\nPrivilege requirements involve an authorized attacker leveraging the SSRF flaw to elevate their privileges beyond their assigned scope.\nThe attack flow begins when the attacker crafts a malicious HTTP request containing manipulated parameters that target internal services or restricted external resources normally inaccessible via standard routing.\nUpon receiving the request, the vulnerable component on the Microsoft Exchange Server fails to properly validate the destination URL and proceeds to dispatch a server-side request to the specified target.\nThe payload behavior forces the server to act as a proxy, querying internal metadata services, local network endpoints, or sensitive administrative interfaces.\nResponses from these internal targets are subsequently processed or potentially leaked back to the attacker, depending on the application response handling.\nPost-exploitation impact includes unauthorized interaction with internal systems, potential exposure of sensitive internal data, and successful privilege escalation within the network architecture."
}