CVE-2026-72676: Improper Control of Generation of Code in Fleet Server Leading to Code Injection

Critical 9.1 EPSS 0.5% Elasticsearch / Kibana

Improper Control of Generation of Code ('Code Injection') (CWE-94) in Fleet Server can lead to the execution of attacker-supplied script content via Code Injection (CAPEC-242). Kibana accepted an identifier for an output configuration without restricting it to safe characters. That identifier is later placed into a server-side script that Fleet Server builds as part of routine agent policy processing, so script syntax embedded in the identifier became part of the script that was executed rather than being treated as data.

CVE-2026-72676CVE identifier
9.1CVSS 3.1 base score (critical)
0.5%EPSS: chance of exploitation in the next 30 days (higher than 46% of CVEs)
2026-08-13published

What do these terms mean? CVE · CVSS score · exploited (KEV) · EPSS · backported fix · all terms

What to do now

Check whether you run Elasticsearch / Kibana and which version (commands below).
Install the fixed version for your system: see “Patch it” below.
sudo systemctl restart elasticsearch (rolling restart node by node in clusters); sudo systemctl restart kibana

Affected and fixed versions

Affected:

Elastic Fleet Server 8.5.0 to 8.19.19
Elastic Fleet Server 9.0.0 to 9.4.4
Elastic Fleet Server 9.5.0

Patch it

Use the commands for your system. Distribution packages often keep an older version number with the fix backported, so compare with the fixed package versions in the table below, not only with the upstream version.

Debian

not in distro repos: artifacts.elastic.co, elasticsearch / kibana

Ubuntu

not in distro repos: artifacts.elastic.co, elasticsearch / kibana

RHEL, AlmaLinux, Rocky, Oracle

not in distro repos: artifacts.elastic.co, elasticsearch / kibana

Fedora

not packaged

SUSE / openSUSE

not in distro repos: artifacts.elastic.co, elasticsearch / kibana

Amazon Linux

not in distro repos: artifacts.elastic.co

Arch Linux

not in official repos

Alpine

not packaged

FreeBSD

pkg update && pkg upgrade elasticsearch8

General update steps for every system are on the Linux and Unix & BSD pages; after updating, see which services to restart.

Sources

Page generated automatically from official sources on 2026-11-03 18:05 UTC. Always confirm with your vendor's advisory.