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Elastic Cloud Enterprise CVE-2026-115711

| EUVDEUVD-2026-112923 MEDIUM
Insertion of Sensitive Information into Externally-Accessible File (CWE-538)
2026-10-29 elastic GHSA-j3hp-3xxc-r2mw
6.4
CVSS 3.1 · Vendor: elastic
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Gain access to internal ECE platform services
  2. Delivery
    Read runtime container info location
  3. Exploit
    Extract container secrets and role token
  4. Execution
    Enroll unauthorized host with token roles
  5. Impact
    Expand control over installation

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V14 - Data Protection Sensitive file access control
Exploitation Conditions

Exploitation requires the attacker to already have access to the internal ECE platform services - i.e., control of a lower-privileged platform component that can read the location where ECE stores runtime information about platform service containers. The exposed data must include secrets from the container configuration, specifically a role token, for the follow-on 'add unauthorized host' impact to apply. Limiting factors: this is adjacent-network, not internet-facing (AV:A), and demands an existing high-privilege internal foothold (PR:H), so it cannot be triggered by an unauthenticated external attacker against a default deployment; it is a post-access escalation primitive. The complete fix is upgrading to ECE 3.8.6 or 4.2.1 as stated in the vendor advisory.

Impact

This is a moderate-severity, privilege-gated information-disclosure flaw rather than an urgent remote threat. The CVSS 3.1 vector (AV:A/AC:H/PR:H/UI:N/S:U, C:H/I:H/A:H, base 6.4) tells a consistent story: exploitation is not internet-facing but requires a foothold on the adjacent ECE internal network AND already-held high privileges (PR:H) - specifically access to the internal ECE platform services. No EPSS score was provided, the vulnerability is not in CISA KEV, and no public exploit was supplied; the only reference is Elastic's own advisory (ESA-2026-218), so there is no public exploit identified at time of analysis. The vuln.today decision label is 'this_month', which aligns with a real-but-not-emergency priority: the high confidentiality/integrity/availability impacts (secret/role-token disclosure that can let an attacker enroll an unauthorized host) are serious, but the PR:H + AV:A prerequisites sharply limit who can reach it. The main tension to flag: the C:H/I:H/A:H impact looks alarming in isolation, yet it is only reachable by an actor who already holds significant internal access, so the practical risk is post-compromise privilege/lateral-movement escalation inside an ECE installation, not initial external compromise. No EPSS was supplied to corroborate or contradict this; absence of EPSS/KEV is noted, not treated as evidence of safety.

Exploit ScenarioDerived

An attacker who has already gained access to a lower-privileged ECE internal platform component reads the externally-accessible location where ECE stores runtime container information, which includes secrets from the container configuration such as role tokens. Using a recovered role token, the attacker enrolls an unauthorized host into the ECE installation with the roles granted by that token, escalating their foothold. No public exploit was identified at time of analysis; exploitation requires the adjacent-network, high-privilege position described in the CVSS vector.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 29, 2026

Elastic Cloud Enterprise stores runtime information about its platform service containers - including secrets drawn from those containers' configuration, such as role tokens - in a location that lower-privileged platform components can read, so an attacker who already controls such a component can retrieve those secrets. Possession of a role token then allows the attacker to register an unauthorized host into the installation carrying that token's roles, which is where the integrity impact comes from. Exposure is confined to adjacent-network access from inside the ECE platform and requires a high-privileged internal foothold (CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H as assessed; the CVE record publishes AC:H), so this is a post-access escalation primitive rather than an internet-facing remote flaw; no public exploit code has been identified and there is no CISA KEV entry. Fixed builds are ECE 3.8.6 and 4.2.1 per the vendor's ESA-2026-218 advisory.

RemediationAI

Upgrade to Elastic Cloud Enterprise 3.8.6 (for the 3.8.x line) or 4.2.1 (for the 4.2.x line); the vendor advisory ESA-2026-218 at https://discuss.elastic.co/t/elastic-cloud-enterprise-ece-3-8-6-and-4-2-1-security-update-esa-2026-218/391264 identifies these as the releases containing the fix, and updating is the complete remediation for the container-runtime information exposure. No vendor-documented workaround is provided in the available references, so interim risk reduction has to come from tightening who can reach and run the internal ECE platform services - restrict adjacent-network access to the platform service network and reduce the set of identities holding platform-component privileges, accepting that this narrows operational flexibility and does not remove the underlying readable-location condition. Because exposed role tokens can be used to enroll an unauthorized host, treat any platform component that could already read the affected location as potentially compromised and rotate the role tokens in addition to patching.

Affected VersionsENISA

Elastic Cloud Enterprise 4.0.0 ≤4.2.0
Elastic Cloud Enterprise 1.0.0 ≤3.8.5

Affected Packages

euvd elastic_cloud_enterprise no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The root cause is CWE-538 (Insertion of Sensitive Information into Externally-Accessible File or Directory), mapped in the disclosure to the CAPEC-37 pattern of retrieving embedded sensitive data. ECE writes runtime metadata about its platform service containers to a location whose access controls are broader than the sensitivity of its contents: container configuration secrets, including role tokens, end up readable by lower-privileged platform components. The CPE entry cpe:2.3:a:elastic:elastic_cloud_enterprise:*:*:*:*:*:*:*:* covers the product family, with 3.8.6 and 4.2.1 as the vendor-published fixed builds. The assessed vector (AV:A/AC:L/PR:H/UI:N) means the attacker must already sit on the adjacent internal network and hold high privileges within the platform - this is not reachable by an unauthenticated external party against a default deployment, and the trigger sequence beyond 'read the storage location, extract a role token, use it to add a host' is not described in the available sources. Confidentiality and integrity are both rated High because the token grants host-enrollment rights matching its roles; scope is Unchanged.

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Severity by source

Vendor (elastic) PRIMARY 6.4 MEDIUM
AV:A/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
vuln.today AI 6.8 MEDIUM

Adjacent internal-services access (AV:A) and an existing high-privilege foothold (PR:H) gate the flaw; once reached, reading the exposed secrets is straightforward so AC:L, and disclosed role tokens enable host enrollment giving C/I/A:H.

3.1 AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.0 AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (elastic).

CVSS VectorVendor: elastic

Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

Insertion of Sensitive Information into Externally-Accessible File or Directory (CWE-538) in Elastic Cloud Enterprise (ECE) can lead to credential disclosure via Retrieve Embedded Sensitive Data (CAPEC-37). ECE stores runtime information about platform service containers in a location that lower-privileged platform components can read, and this information includes secrets from the container configuration. An attacker with access to the internal ECE platform services can obtain these secrets, which include role tokens. A role token can let the attacker add an unauthorized host to the installation with the roles of that token.

Threat Intelligence Overview

EPSS Score
0.2%
Top 87% exploitable
Prevalence
Medium
enterprise Elasticsearch orchestration platform, on-prem/private-cloud installs only
Social Media
1
Sightings
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Controlled
Automatable
No
Human Impact· derived
Medium
Technical Impact
Total

Priority Score

32
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +32
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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