CVE-2023-45727
North Grid Proself Improper Restriction of XML External Entity (XXE) Reference Vulnerability
North Grid Proself
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.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 3 December 2024. US federal agencies were required to remediate it by 24 December 2024.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 4.8%, which is higher than 92% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Frequently asked questions
Is CVE-2023-45727 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2023-45727.
What does CVE-2023-45727 affect?
CVE-2023-45727 affects North Grid Proself. 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.
How severe is CVE-2023-45727?
CVE-2023-45727 is rated HIGH with a CVSS base score of 7.5. EPSS puts the probability of exploitation in the next 30 days at 4.8%, higher than 92% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 24 December 2024.
How should organisations respond to CVE-2023-45727?
Apply the vendor patch for North Grid Proself as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.