High (8.1) in Elastic Elasticsearch. In CISA KEV since 2022-03-25. EPSS 89% chance of exploitation in the next 30 days. Fixed in org.elasticsearch:elasticsearch 1.4.0.Beta1.
The default configuration in Elasticsearch before 1.2 enables dynamic scripting, which allows remote attackers to execute arbitrary MVEL expressions and Java code via the source parameter to _search. NOTE: this only violates the vendor's intended security policy if the user does not run Elasticsearch in its own independent virtual machine.
Severity
CVSS 3.1
8.1 high
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS
89% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)