XML External Entity Injection in PVE Storage Libraries

libpvestorage-perl v9.1.1 and libpve-storage-perl v8.3.7 were discovered to contain an XML External Entity (XXE) vulnerability.

Casky was already ahead

This CVE exploits attack patterns that Casky's 322matched 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-2026-51080 exposes a critical XML External Entity (XXE) vulnerability in libpve-storage-perl versions 8.3.7 and 9.1.1, core storage management libraries used in Proxmox Virtual Environment infrastructure. With a CVSS score of 9.8, this vulnerability allows attackers to read arbitrary files, perform Server-Side Request Forgery (SSRF) attacks, and potentially achieve remote code execution on systems running affected versions. Organizations deploying Proxmox-based virtualization environments face immediate risk, as storage libraries are fundamental to infrastructure operations and often run with elevated privileges.

Casky's 322 mapped security skills leverage Claude's extended reasoning to detect XXE attack patterns across the MITRE ATT&CK framework, specifically tracking TA0001 (Initial Access) and TA0043 (Reconnaissance) techniques. Practitioners using Casky would identify suspicious XML parsing activities, external entity declarations in storage configuration requests, and anomalous file system access attempts that precede successful XXE exploitation. The platform's skill-mapping would surface indicators such as malformed XML payloads targeting entity expansion, unusual network connections initiated during storage operations, and attempts to access /etc/passwd or other sensitive files through entity resolution—enabling security teams to detect reconnaissance activities before full compromise occurs.

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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 →

322 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-51080.

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-2026-51080

Casky has 322 skills that investigate the attack patterns behind CVE-2026-51080. Run one and get CVSS-scored findings in 3 minutes.

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