CyberSecBulletin
CVE-2025-37729NVD status: Analyzed

Elastic Cloud Enterprise (ECE): Improper Neutralization of Special Elements Used in a Template Engine

Published Updated By the CyberSecBulletin desk

CVE-2025-37729 is a high-severity improper neutralization of special elements used in a template engine vulnerability in Elastic Cloud Enterprise (ECE) from Elastic, with a CVSS 3.1 base score of 7.2 out of 10. It can be exploited remotely over the network by an attacker with administrator privileges, without any action from a user. Affected Elastic Cloud Enterprise (ECE) versions: 2.5.0 through 3.8.1; 4.0.0 through 4.0.1. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.66% chance of exploitation within 30 days, higher than 52% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Elastic Cloud Enterprise to 3.8.2 or 4.0.2, whichever matches your release line, or a later version.
  2. Read the advisory on discuss.elastic.co for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
ElasticElastic Cloud Enterprise (ECE)2.5.0 through 3.8.1; 4.0.0 through 4.0.1Not stated
ElasticElastic Cloud Enterprise2.5.0 up to, but not including, 3.8.2; 4.0.0 up to, but not including, 4.0.23.8.2, 4.0.2

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
HighAdministrator-level access is required first.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.19.1CriticalCNA (elastic.co)
CVSS 3.17.2HighNVD

Official description

Improper neutralization of special elements used in a template engine in Elastic Cloud Enterprise (ECE) can lead to a malicious actor with Admin access exfiltrating sensitive information and issuing commands via a specially crafted string where Jinjava variables are evaluated.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Neutralization of Special Elements Used in a Template Engine

The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine.

How developers prevent this class of flaw

  • Choose a template engine that offers a sandbox or restricted mode, or at least limits the power of any available expressions, function calls, or commands.
  • Use the template engine's sandbox or restricted mode, if available.

More Improper Neutralization of Special Elements Used in a Template Engine vulnerabilities (CWE-1336)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Elastic Cloud Enterprise (ECE)

All Elastic Cloud Enterprise (ECE) vulnerabilities

Recent Improper Neutralization of Special Elements Used in a Template Engine vulnerabilities

Spotted an error? Tell us.