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CVE-2023-45612

CriticalPublished

In JetBrains Ktor before 2.3.5 default configuration of ContentNegotiation with XML format was vulnerable to XXE

Published: Oct 9, 2023
Updated: Sep 19, 2024
Assigning CNA: JetBrains
Evidence observed: Aug 8, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

0.6%

Low · next 30 days

Percentile: 46.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

In JetBrains Ktor before 2.3.5 default configuration of ContentNegotiation with XML format was vulnerable to XXE

Sources

CVE-2023-45612-PoCPoC
Proof of concept for XXE in Ktor (CVE-2023-45612)
ktor-xxePoC
CVE-2023-45612 POC and vulnerable project.
ktor-cve-2023-45612-pocPoC
Ktor XXE Injection Proof-of-Concept (CVE-2023-45612)
ktor-xxe-pocPoC

Responsible use

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PoC for CVE-2023-45612

cve-2023-45612_exploitPoC

Reproduction of a high severty security problem that allows XXE (XML eXternal Entity) attacks on Ktor's XML serialization.

CVE-2023-45612-PoCPoC

Proof-of-concept demonstrating XXE vulnerability in JetBrains Ktor < 2.3.5 via XML ContentNegotiation, with prevention guidelines and OWASP-based analysis.

ktor-xxe-pocPoC

This repository provides a Proof of Concept for CVE-2023-45612, demonstrating an XML External Entity (XXE) injection vulnerability in JetBrains Ktor versions prior to 2.3.5.