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CVE-2023-45727

64
FAUCET Score

CVE-2023-45727 is an XML External Entity (XXE) vulnerability affecting Proself Enterprise/Standard Edition (v5.62 and earlier), Proself Gateway Edition (v1.65 and earlier), and Proself Mail Sanitize Edition (v1.08 and earlier). This high-severity vulnerability, rated 7.5 CVSS, allows unauthenticated remote attackers to read arbitrary server files, including account information, through specially crafted XML requests. It has a high FAUCET Risk Score of 99/100 and is actively exploited in the wild, as confirmed by its inclusion in CISA's KEV catalog. While no public exploit code is available, the vulnerability has garnered significant community discussion and media coverage, indicating its importance.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.09CPE matchmatch criteria
cpe:2.3:a:northgrid:proself:*:*:*:*:mail_sanitize:*:*:*
< 1.66CPE matchmatch criteria
cpe:2.3:a:northgrid:proself:*:*:*:*:gateway:*:*:*
< 5.63CPE matchmatch criteria
cpe:2.3:a:northgrid:proself:*:*:*:*:enterprise:*:*:*
< 5.63CPE matchmatch criteria
cpe:2.3:a:northgrid:proself:*:*:*:*:standard:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.54%
Probability of exploitation in next 30 days
EPSS Percentile
88.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Dec 3, 2024
This CVE's current EPSS score of 0.0354 is in the 79th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
jvn.jp / en/jp/JVN95981460
Third Party Advisory
proself.jp / information/153
Vendor Advisory