Security Digest · Vulnerability record · Known exploited
CVE-2023-45727: North Grid Proself Improper Restriction of XML External Entity (XXE) Reference Vulnerability
Exploited in the wild (CISA KEV). 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.
CISA KEV · added 2024-12-03 CVSS 7.5 High EPSS 4.8% · p92
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- 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.
CISA’s summary
North Grid Proself Enterprise/Standard, Gateway, and Mail Sanitize contain an improper restriction of XML External Entity (XXE) reference vulnerability, which could allow a remote, unauthenticated attacker to conduct an XXE attack.
Weakness type: CWE-611.
Product: North Grid Proself · Assigned by: jpcert · Published: 2023-10-18
Affected and fixed versions
| Vendor | Product | Affected versions (per 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 scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADP | 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- 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.
Timeline
- — CVE record published by jpcert
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CISA remediation deadline for US federal agencies
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- Listed in CISA KEV notes (proself.jp) proself.jp
Vulnerability records
- CVE.org record CVE-2023-45727 cve.org
- NVD entry CVE-2023-45727 nvd.nist.gov
Government
Other references from the CVE record and advisory
- jvn.jp jvn.jp
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