CVE-2026-66090— XML External Entity (XXE) Injection in Metadata Field Allows Arbitrary File Read

Quick assessment

Affected

Apereo Foundation openEQUELLA

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 2026.1 版本之前的 openEQUELLA 中，用于解析项目元数据的 XML 解析器未禁用外部实体解析。拥有创建项目权限（CREATE_ITEM）的用户可以向接口提交特制的 XML 数据，导致服务器读取 openEQUELLA 服务可访问的任意文件，或向攻击者指定的位置发起请求（SSRF），其中包括云实例的元数据服务。

CVSS 7.1 · High Updated Oct 29, 2026

Possible ATT&CK Techniques 3 AI

T1078.004 · Cloud Accounts T1566.003 · Spearphishing via Service T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

XML External Entity (XXE) Injection in Metadata Field Allows Arbitrary File Read

Source: CVE Program / CVE List V5

Vulnerability Description

In openEQUELLA before 2026.1, the XML parser used for item metadata does not disable external entity resolution. A user permitted to create items (CREATE_ITEM) can submit crafted XML to POST /api/item and cause the server to read arbitrary files accessible to the openEQUELLA service, or make requests to attacker-specified locations (SSRF), including cloud instance metadata services.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N

Source: CVE Program / CVE List V5

Vulnerability Type

XML外部实体引用的不恰当限制(XXE)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Apereo Foundation	openEQUELLA	0 ~ 2026.1	-

II. Public POCs for CVE-2026-66090

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-66090

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Other References for CVE-2026-66090 (2)

https://github.com/openequella/openEQUELLA/security/advisories/GHSA-668q-3hpr-6c96 vendor-advisory
https://openequella.github.io/guides/ product

https://www.cve.org/CVERecord?id=CVE-2026-66090

Same Patch Batch · Apereo Foundation · 2026-10-29 · 6 CVEs total

CVE-2026-66088	9.4 CRITICAL	Unrestricted Command Execution via system.execute
CVE-2026-66091	6.9 MEDIUM	Unauthenticated IDOR Enables Disclosure of Other Users’ last-known details
CVE-2026-66089	6.1 MEDIUM	XML External Entity (XXE) Vulnerability in SOAP Interface Allows External Entity Expansion
CVE-2026-66092	4.8 MEDIUM	Stored XSS in pre-login notice via reachable legacy logon route
CVE-2026-16889	4.8 MEDIUM	Stored XSS via Pre-Login Notice Image Upload Serves Attacker HTML from Application Origin

IV. Related Vulnerabilities

Same product: openEQUELLA

Same vendor: Apereo Foundation

Same weakness: CWE-611