High severity · published Aug 12, 2026
CVE-2026-18952
Missing Input Validation in Threat Intel Feed Parser in OpenSearch Security Analytics Plugin
8.1
CVSS
0.5%
EPSS
No
On KEV
Description
Missing input validation in the threat intelligence feed parser in the OpenSearch Security Analytics plugin might allow an authenticated remote user to perform server-side request forgery and read local files via a crafted URL parameter to the threat intel source configuration endpoint.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
Opensearch · AWS
2.15.0 before 3.5.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18952
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18952
aws.amazon.com
https://aws.amazon.com/security/security-bulletins/2026-079-aws/
docs.aws.amazon.com
https://docs.aws.amazon.com/opensearch-service/latest/developerguide/service-software.html
github.com
https://github.com/opensearch-project/security-analytics/security/advisories/GHSA-w946-8jxc-6v3m
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