XML External Entity Injection in Cosminexus Component Container

Improper restriction of XML external entity reference vulnerability in Cosminexus Component Container. This issue affects Cosminexus Component Container: from 11-70-01 before 11-70-03, from 11-60 before 11-60-03, from 11-50 through 11-50-03, from 11-40 through 11-40-03, from 11-30 through 11-30-08, from 11-20 before 11-20-10, from 11-10 through 11-10-11, from 11-00 before 11-00-13, from 09-87 before 09-87-10, from 09-80 before 09-80-05, from 09-70 before 09-70-28, from 09-50 through 09-50-22, and from 09-00 through 09-00-18.

Casky was already ahead

This CVE exploits attack patterns that Casky's 323matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

CVE-2026-71375 represents an XML External Entity (XXE) injection vulnerability affecting multiple versions of Hitachi Cosminexus Component Container, a widely-used Java application server. The vulnerability stems from improper restriction of XML external entity references, allowing attackers to read arbitrary files, conduct denial-of-service attacks, or establish server-side request forgery (SSRF) chains. This matters significantly because XXE vulnerabilities are a classic attack vector that remains prevalent in enterprise middleware; organizations running affected Cosminexus versions (spanning from 09-50 through 11-70) face risk of data exfiltration and lateral movement if XML processing is exposed to untrusted input. The broad version range indicates this has been a persistent gap across the platform's lifecycle.

Casky's 323 mapped security skills leverage Claude's reasoning to detect XXE exploitation attempts by analyzing attack patterns across MITRE ATT&CK techniques TA0001 (Reconnaissance) and TA0043 (Reconnaissance via network service scanning and probing). Practitioners using Casky would observe detection of: (1) suspicious XML payloads containing DOCTYPE declarations or ENTITY definitions pointing to external resources, (2) file access attempts targeting /etc/passwd, configuration files, or credentials stored on the server, (3) outbound network connections from the application server to unexpected internal or external destinations (SSRF indicators), and (4) error messages or timing patterns revealing successful entity resolution. The platform's extended reasoning capability correlates these indicators across logs, network traffic, and application behavior to surface XXE exploitation chains that manual rules might miss, enabling practitioners to distinguish between benign XML processing and active attack reconnaissance or data exfiltration attempts.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

323 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-71375.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

Run

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0043

Investigate the attack patterns behind CVE-2026-71375

Casky has 323 skills that investigate the attack patterns behind CVE-2026-71375. Run one and get CVSS-scored findings in 3 minutes.

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