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

High severity, CVSS 7.5. Actively exploited: in CISA KEV since 2024-12-03. EPSS: 3.5% chance of exploitation in the next 30 days.

Proself Enterprise/Standard Edition Ver5.62 and earlier, Proself Gateway Edition Ver1.65 and earlier, and Proself Mail Sanitize Edition Ver1.08 and earlier allow a remote unauthenticated attacker to conduct XML External Entity (XXE) attacks. By processing a specially crafted request containing malformed XML data, arbitrary files on the server containing account information may be read by the attacker.

Affected products

• North Grid Proself: before 1.09 (fixed in 1.09); before 1.66 (fixed in 1.66); before 5.63 (fixed in 5.63)

Published 2023-10-18. Last modified 2026-06-17.