Microsoft Exchange Server SSRF and Code Injection

Privilege escalation via server-side request forgery in Microsoft Exchange Server allows an authenticated attacker with low-level network access to coerce the Exchange server into making attacker-controlled requests, resulting in high impact to confidentiality, integrity, and availability. The flaw is network-exploitable with low complexity (CVSS 8.8) but requires prior authentication, and no public exploit identified at time of analysis. As a Microsoft-discovered issue (reported by secure@microsoft.com), it is consistent with the broader pattern of Exchange SSRF chains used to pivot to elevated mailbox or domain access.

Remote code injection in Microsoft Exchange Server (2016 CU23, 2019 CU14/CU15, and Subscription Edition RTM) lets an unauthenticated network attacker execute arbitrary code on the mail server, per CVSS 8.1 (AV:N/PR:N) and CWE-94. Microsoft (secure@microsoft.com) has released fixes, but the CVSS AC:H rating and SSVC 'Automatable: no' assessment indicate exploitation is non-trivial rather than push-button. There is no public exploit identified at time of analysis, and EPSS is low at 0.08% (23rd percentile).

Server-side request forgery in Microsoft Exchange Server allows an authenticated attacker with low privileges to coerce the Exchange server into making arbitrary outbound requests, resulting in disclosure of sensitive information and potential integrity impact across internal network resources. The CVSS 8.1 score reflects the high confidentiality and integrity impact from a network-reachable, low-complexity attack, though no public exploit identified at time of analysis. The vulnerability is tagged as an Authentication Bypass / SSRF, suggesting the SSRF primitive may be leveraged to bypass network-based authentication boundaries (e.g., reaching internal trusted endpoints).

Spoofing via reflected/stored cross-site scripting in Microsoft Exchange Server allows a remote unauthenticated attacker to execute attacker-controlled script in the context of a victim's authenticated Exchange session after the victim interacts with a crafted link or message. With a CVSS 3.1 base score of 8.1 (AV:N/AC:L/PR:N/UI:R) and high confidentiality and integrity impact, successful exploitation enables session hijacking, mailbox content disclosure, and message manipulation, though no public exploit identified at time of analysis and the issue is not listed in CISA KEV.