Which products and versions are affected by CVE-2023-45727?

Affected: Proself (Northgrid); Proself Enterprise/Standard Edition versions >= Ver5.62 and earlier; Proself Gateway Edition versions >= Ver1.65 and earlier, among others. The full list is in the CVE brief.

Is CVE-2023-45727 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 13, 2024.

Is CVE-2023-45727 in the CISA KEV catalog?

Yes. It was added on Dec 3, 2024 with a federal remediation due date of Dec 24, 2024.

Is there a public exploit for CVE-2023-45727?

Public exploit code is available.

Is there a fix for CVE-2023-45727?

Fixed versions are available, including Proself 1.09, Proself 1.66, Proself 5.63.

How urgently should CVE-2023-45727 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2023-45727

HighExploitedPublic exploit

Published Oct 18, 2023 · Updated Oct 24, 2025

Key Facts

Patch immediately

CVE-2023-45727 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Proself (Northgrid), Proself Enterprise/Standard Edition, Proself Gateway Edition and 1 more product.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 13, 2024. Public exploit code is available.
EPSS estimates a 3.5% probability of exploitation in the next 30 days.
Fixed versions are available, including Proself 1.09, Proself 1.66, Proself 5.63.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

7.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS (30-day exploit likelihood)

3.5%

Higher than 89.1% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2023-45727 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Dec 3, 2024	Dec 24, 2024	Not reported
Industry KEV feed	Sep 13, 2024	Dec 24, 2024	Not reported
CIRCL KEV	Dec 3, 2024	Dec 24, 2024	Not reported
ENISA EUVD	Dec 3, 2024	n/a	Not reported

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Affected Products

7 affected entries in total

Product	Affected versions	Fixed in
ProselfNorthgrid	See advisory	5.63
Proself Enterprise/Standard Edition	>= Ver5.62 and earlier	n/a
Proself Gateway Edition	>= Ver1.65 and earlier	n/a
Proself Mail Sanitize Edition	>= Ver1.08 and earlier	n/a

Patched Releases

Proself

1.09, 1.66, 5.63

Timeline

Publicly disclosed
Oct 18, 2023
Added to Industry KEV feed
Sep 13, 2024
Added to CISA KEV
Dec 3, 2024
Added to CIRCL KEV
Dec 3, 2024
Added to ENISA EUVD
Dec 3, 2024
Last updated
Oct 24, 2025

Weakness Type

CWE-611 Improper Restriction of XML External Entity Reference

References

advisoryhttps://jvn.jp/en/jp/JVN95981460/
advisoryhttps://www.proself.jp/information/153/
exploitVulnCheck exploitation report
exploitVulnCheck exploitation report
exploitVulnCheck exploitation report

1 more references in the full CVE brief

FAQ

Common Questions.

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.
Affected: Proself (Northgrid); Proself Enterprise/Standard Edition versions >= Ver5.62 and earlier; Proself Gateway Edition versions >= Ver1.65 and earlier, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 13, 2024.
Yes. It was added on Dec 3, 2024 with a federal remediation due date of Dec 24, 2024.
Public exploit code is available.
Fixed versions are available, including Proself 1.09, Proself 1.66, Proself 5.63.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2023-45727 Running On Your Attack Surface?

Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.