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Vulnerabilities CVE-2026-54366

CVE-2026-54366

High
Open
TLP:CLEAR

CentreStack < 17.4 XXE via SharePoint Storage Configuration

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Description

CentreStack before 17.4 contains an XML external entity (XXE) injection vulnerability that allows unauthenticated attackers to exfiltrate arbitrary files by supplying a malicious URL to the SharePoint storage configuration handler. Attackers can send a crafted request to the unauthenticated StorageConfig endpoint causing the server to fetch and parse attacker-controlled XML containing external DTD references, resulting in out-of-band file exfiltration of sensitive files such as Web.config, which may contain database credentials and cryptographic key material.

Details

CVSS Score
8.7
EPSS Score
0.29%

21.2th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Confidence
90%
Published
Jul 30, 2026
Last Modified
Jul 30, 2026
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