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CVE-2023-45727

HIGH
7.5
CVSS Score
Published: October 18, 2023 at 09:01 AM UTC
Updated: June 17, 2026 at 06:29 AM UTC
3 products affected across 1 vendorProselfProself Mail Sanitize EditionProself Enterprise/Standard Edition

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Severity
HIGH7.5
Exploitation
CISA KEV
Exploit prediction
EPSS 5%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score4.8%

EPSS (Exploit Prediction Scoring System) estimates a 4.8% chance this CVE is exploited in the wild within the next 30 days — higher than 92% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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.

Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Ransomware Use
Unknown
Added to KEV
Dec 3, 2024
Remediation Due
Dec 24, 2024
676 days overdue
Notes
https://www.proself.jp/information/153/
https://nvd.nist.gov/vuln/detail/CVE-2023-45727

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Proself· Northgrid
95%
v ≤ 1.08v ≤ 1.65v ≤ 5.62v < 1.09v < 1.66v < 5.63
Affected range stops below 1.09, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.66, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.63, so it looks safe — our inference, not a vendor statement
Proself Enterprise/Standard Edition· Northgrid
60%
v ≤ 5.62
Proself Mail Sanitize Edition· Northgrid
60%
v ≤ 1.08

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Third Party Advisory
Source: [email protected]
https://jvn.jp/en/jp/JVN95981460/
Vendor Advisory
Source: [email protected]
https://www.proself.jp/information/153/
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-45727

SSVC — Action Prioritization

SSVCActiveAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-611

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