How severe is CVE-2023-45727?

CVE-2023-45727 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2023-45727?

Affected package information for CVE-2023-45727 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2023-45727?

No fixed version has been published for CVE-2023-45727 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

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

Yes. There are 1 known exploit references for CVE-2023-45727, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2023-45727?

CVE-2023-45727 has an EPSS (Exploit Prediction Scoring System) score of 21.0%, placing it in the 96th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score warrants monitoring and prompt remediation.

Is CVE-2023-45727 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2023-45727 (North Grid Proself Improper Restriction of XML External Entity (XXE) Reference Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2024-12-03. CISA required all US federal civilian agencies to remediate this vulnerability by 2024-12-24. The required action was: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2023-45727?

CVE-2023-45727 is classified as XML External Entity (XXE) (CWE-611). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

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

CVE-2023-45727 affects northgrid proself. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2023-45727 published, and has it been updated?

CVE-2023-45727 was published on October 18, 2023 and was last updated on October 24, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2024-12-03 — agencies required to remediate by 2024-12-24

CVE-2023-45727

HIGH

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…

Published

Oct 18, 2023

Updated

Oct 24, 2025

Affected

0 pkgs

Patched

None yet

Exploits

1 known

EPSS Exploitation Probability

via FIRST.org ↗

21.0%probability of exploitation in next 30 days

Moderate Risk96th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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 Products

1 product · 4 configurations

Application

proselfnorthgrid

< 5.63

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Proself Enterprise/Standard Edition Ver5.62 and earlier, Proself Gateway…

cisa.govCISADec 2024

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2023-45727 in your stack?

O3 detects CVE-2023-45727 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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