---
title: "CVE-2023-45727: North Grid Proself Improper Restriction of XML External Entity (XXE) Reference Vulnerability"
url: https://erroneo.us/security/cve/CVE-2023-45727/
description: "CVE-2023-45727 (North Grid Proself): Exploited in the wild (CISA KEV). Proself Enterprise/Standard Edition Ver5.62 and earlier, Proself Gateway Edition…"
type: vulnerability-record
section: "Security Digest"
date_published: 2023-10-18
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2023-45727"
kev: true
cvss: 7.5
epss: 0.04822
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run North Grid Proself. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-12-03, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-12-24 ; treat that as the outer limit, not the target.
- EPSS 4.8% , percentile 92: FIRST’s model estimates a 4.8% chance of exploitation activity in the next 30 days, higher than 92% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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 (CVE record)

- North Grid Corporation Proself Enterprise/Standard Edition: Ver5.62 and earlier
- North Grid Corporation Proself Gateway Edition: Ver1.65 and earlier
- North Grid Corporation Proself Mail Sanitize Edition: Ver1.08 and earlier

## Severity

- CISA-ADP CVSS 3.1: 7.5 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`

## Exploitation

- CISA KEV: added 2024-12-03; federal due date 2024-12-24. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 4.82% probability of exploitation activity in the next 30 days; percentile 92.

## Sources

- [Listed in CISA KEV notes (proself.jp)](https://www.proself.jp/information/153/)
- [CVE.org record CVE-2023-45727](https://www.cve.org/CVERecord?id=CVE-2023-45727)
- [NVD entry CVE-2023-45727](https://nvd.nist.gov/vuln/detail/CVE-2023-45727)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-45727)
- [jvn.jp](https://jvn.jp/en/jp/JVN95981460/)

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Source page: https://erroneo.us/security/cve/CVE-2023-45727/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt