Introduction
Attackers who gain administrative access to Elastic Cloud Enterprise (ECE) through a readonly account can create or delete users, escalate privileges, and disrupt managed Elasticsearch clusters. CVE-2025-37736, a high-severity improper authorization vulnerability that affects a wide range of ECE deployments, made that possible. Elastic Cloud Enterprise is the orchestration platform from Elastic NV that enterprises use to manage Elasticsearch clusters at scale across on-premises and hybrid environments. Because ECE is widely deployed and built into critical infrastructure, flaws in its access controls hit especially hard for organizations that rely on Elastic's stack for security, analytics, and business operations.
Technical Information
CVE-2025-37736 comes from improper authorization logic in Elastic Cloud Enterprise. The built-in readonly user can call fifteen administrative API endpoints that should be restricted to privileged roles. These endpoints create, modify, and delete service accounts, user accounts, and authentication keys. The readonly user exists for audit and monitoring, and gives external integrations limited access without administrative privileges. Because authorization checks were missing or incorrect (CWE-863), this user could perform actions such as:
- Creating new service accounts:
POST:/platform/configuration/security/service-accounts - Deleting service accounts:
DELETE:/platform/configuration/security/service-accounts/{user_id} - Modifying service accounts:
PATCH:/platform/configuration/security/service-accounts/{user_id} - Creating and deleting service account keys:
POST:/platform/configuration/security/service-accounts/{user_id}/keys,DELETE:/platform/configuration/security/service-accounts/{user_id}/keys/{api_key_id} - Modifying the current user:
PATCH:/user - Creating new users:
POST:/users - Managing authentication keys:
POST:/users/auth/keys,DELETE:/users/auth/keys,DELETE:/users/auth/keys/_all,DELETE:/users/auth/keys/{api_key_id} - Deleting and modifying users:
DELETE:/users/{user_id}/auth/keys,DELETE:/users/{user_id}/auth/keys/{api_key_id},DELETE:/users/{user_name},PATCH:/users/{user_name}
The root cause is that these endpoints do not enforce role-based access control. An attacker with readonly credentials, which are often used for integrations and monitoring, could create new administrative accounts or keys and then use them to take full control of the ECE environment. The attack needs only network access and valid readonly credentials, so it is feasible both for external attackers (if credentials are leaked or stolen) and for insiders. No public code snippets or PoC are available, and exploitation requires no user interaction beyond using the credentials. A successful attack compromises ECE's confidentiality, integrity, and availability, because attackers can access logs, modify configurations, and disrupt services.
Patch Information
Elastic fixed the improper authorization vulnerability in Elastic Cloud Enterprise (ECE) in versions 3.8.3 and 4.0.3. These releases block the built-in readonly user from APIs it should not reach, which prevents the privilege escalation.
Upgrade to one of these patched versions. Administrators should also audit their systems for users or service accounts that the readonly user may have created without anyone intending it. Elastic provides a tool that lists these accounts and can delete them. Take care when removing accounts, so that you do not disrupt legitimate services.
If you cannot upgrade right away, Elastic recommends using this tool in the meantime to find and manage unauthorized accounts. Upgrading is still the most effective way to fully mitigate the vulnerability.
Patch Reference: Elastic Security Advisory ESA-2025-22
Detection Methods
To detect possible exploitation of CVE-2025-37729 in Elastic Cloud Enterprise (ECE), organizations should use the following monitoring and analysis methods.
Log Analysis for Malicious Payloads:
Inspect ECE request logs regularly for indicators that may point to exploitation attempts. Elastic recommends this search query for finding suspicious activity:
(payload.name : int3rpr3t3r or payload.name : forPath)
The query matches payloads containing the terms "int3rpr3t3r" or "forPath", both indicators of malicious injection attempts. Filtering logs with it lets security teams find and investigate anomalous requests that could signal an attack. (discuss.elastic.co)
Monitoring Deployment Plan Modifications:
The vulnerability exploits how the ECE admin console processes deployment plans, so monitor for unauthorized or unexpected changes to those plans. Set alerts for modifications that fall outside established change management procedures, especially changes made by users with administrative privileges.
User Activity Auditing:
Audit user activity thoroughly, focusing on accounts with administrative access. Look for the creation of new users or service accounts, especially by accounts that do not usually do that. This can help identify possible privilege escalation attempts or insider threats.
Anomaly Detection in Log Data:
Run anomaly detection tools over log data to find unusual patterns or behavior. Machine learning models can be trained on normal operational patterns and flag deviations that may indicate exploitation attempts. This makes it easier to detect zero-day attacks and sophisticated intrusion methods.
Integration with Security Information and Event Management (SIEM) Systems:
Send ECE logs to a SIEM to centralize monitoring and event correlation. The SIEM can then analyze events and raise alerts in real time, so the team can respond quickly to possible security incidents. Configure the SIEM to recognize the specific indicators associated with CVE-2025-37729.
Regular Review of Access Controls:
Review and update access controls periodically so that only authorized personnel have administrative privileges. Apply the principle of least privilege and limit access to critical systems and functions, which reduces the risk of exploitation.
Detection Reference: Elastic Security Advisory ESA-2025-21
Affected Systems and Versions
- Elastic Cloud Enterprise versions after 3.8.0 up to 3.8.2
- Elastic Cloud Enterprise versions after 4.0.0 up to 4.0.2
- All configurations of ECE using the built-in readonly user are vulnerable
Vendor Security History
Elastic has fixed similar privilege escalation and authorization issues in ECE before, including:
- CVE-2024-37282 (privilege escalation, CVSS 8.1, patched June 2024)
- CVE-2023-31418 (authorization flaw, CVSS 7.5, patched October 2023)
For CVE-2025-37736, Elastic published prompt advisories, patched releases, and a cleanup tool. The company is known for responsible disclosure and generally timely patching, but the repeated authorization issues in ECE point to an area that still needs work.
