Vulnerability · Published Oct 29, 2026 · Assigned by MON-CSIRT
CVE-2026-66089XML External Entity (XXE) Vulnerability in SOAP Interface Allows External Entity Expansion
Medium 6.1
In plain English
A medium-severity XML external entity in openEQUELLA from Apereo Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities).
Severity (CVSS 4.0)6.1Medium
Exploit odds (30 days)0.3%top 80.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
In openEQUELLA before 2026.1, the SOAP API parses XML supplied in the stopEdit operation with a parser that resolves external entities. This allows an attacker to read arbitrary files accessible to the openEQUELLA service or cause the server to issue requests to attacker-specified locations (SSRF).
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apereo Foundation | openEQUELLA | 0 – before 2026.1 |
Weakness: CWE-611 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:L/SC:L/SI:N/SA:N