External Entity Resolution Vulnerability in openEQUELLA by Knowledge 11
CVE-2026-66090

7.1HIGH

Key Information:

Vendor

Apereo Foundation

Status
Openequella
Vendor
CVE Published:
29 October 2026

What is CVE-2026-66090?

The openEQUELLA platform prior to version 2026.1 has a vulnerability in its XML parsing mechanism related to external entity resolution. This oversight allows users with item creation permissions to craft malicious XML payloads. Such payloads can exploit the server's ability to read sensitive files within its accessible file system or perform Server-Side Request Forgery (SSRF) attacks, potentially redirecting requests to unauthorized locations, including sensitive cloud metadata services.

Affected Version(s)

openEQUELLA 0 < 2026.1

References

https://github.com/openequella/openEQUELLA/security/advis...
vendor-advisory
https://openequella.github.io/guides/
product

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

feixy
.