CVE-2026-66090 PUBLISHED

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

Assigner: MON-CSIRT
Reserved: 24.07.2026 Published: 29.10.2026 Updated: 29.10.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 7.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	Low
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	Apereo Foundation
Product	openEQUELLA
Versions	Default: unaffected affected from 0 to 2026.1 (excl.)

Solutions

Update to vendor recommended versions

Credits

feixy finder

References

Problem Types

CWE-611 Improper restriction of XML external entity reference CWE

Impacts

CAPEC-201 Serialized Data External Linking
CAPEC-250 XML Injection