What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2024-12-03
• EPSS: 4.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-18 · updated 2026-06-17
• Weakness: CWE-611

Description

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

• Northgrid Proself: before 1.09; before 1.66; before 5.63 — fixed in 1.09, 1.66, 5.63

How to fix

Upgrade to a fixed version: Northgrid Proself 1.09, 1.66, 5.63. Check the vendor advisory for mitigations.

References

• https://jvn.jp/en/jp/JVN95981460/
• https://www.proself.jp/information/153/
• https://jvn.jp/en/jp/JVN95981460/
• https://www.proself.jp/information/153/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-45727

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