CentreStack < 17.4 XXE via SharePoint Storage Configuration (CVE-2026-54366) | HOL Guard CVE

High · CVSS 8.7CVE-2026-54366

CentreStack < 17.4 XXE via SharePoint Storage Configuration

Answer in brief

CVE-2026-54366 records a High severity (CVSS 8.7) vulnerability in CentreStack < 17.4 XXE via SharePoint Storage Configuration. The current sources do not mark it as known exploited. The current feed maps Gladinet/CentreStack (generic), Gladinet/CentreStack (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 30, 2026Updated Aug 14, 2026Source checked Sep 29, 2026First seen by HOL Aug 14, 2026Material review Aug 14, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.7
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Gladinet/CentreStack (generic), Gladinet/CentreStack (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Gladinet/CentreStackgeneric	>=0 <17.4	17.4
Gladinet/CentreStackgeneric	*	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Gladinet/CentreStack, Gladinet/CentreStack.
Review the reported fix. Update Gladinet/CentreStack to 17.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 14, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.