Threat Intelligence Report — CVE-2026-75940

Executive Summary

CVE-2026-75940 is a hardcoded-credentials vulnerability (CWE-798) in the Lenovo Health Android Application, a product distributed exclusively in the Chinese market. Successful exploitation could allow an attacker to access sensitive health-related information, with a CVSS v3.1 base score of 9.1 (Critical). The exact credential material, affected versions, and remediation guidance are not disclosed in the available intelligence, and no public proof-of-concept, exploit code, or vendor patch has been observed.

Technical Analysis

The vulnerability is classified under CWE-798: Use of Hard-Coded Credentials, and mapped to Lenovo's Android health application. Based on the vulnerability class, the mechanism is as follows:

• Root cause: Embedded, static credential material (such as API keys, service-account secrets, encryption keys, or authentication tokens) is present within the application or its code. Because these values are fixed and shipped with the product, they can be recovered by anyone with access to the application package.
• Attack surface: As an Android application, the relevant surfaces are the distributed APK (which can be decompiled or statically analyzed) and any backend service that honors the embedded credentials. Note the AV:N (network) and PR:N (no privileges) vector, meaning the recovered credential can be used remotely without prior authorization.
• Confidentiality/Integrity: CVSS subscores are C:H/I:H/A:N — high confidentiality and integrity impact, but no availability impact. This is consistent with credential misuse granting read and write access to health-related data (e.g., retrieving or modifying patient records via an authenticated backend API), while not degrading service uptime.

Integrity caveat: The NVD description is sparse. No specific class names, function names, endpoints, or hardcoded literal values are disclosed. This report therefore describes the vulnerability at the class level; the precise secret type (e.g., a SymmetricKey, an OAuth client secret, a database password) must be confirmed via vendor disclosure or independent analysis. It is preferable to state insufficient technical detail than to fabricate implementation specifics.

Exploitation Scenarios

No public PoC is available; the attack chain below is inferred from the vulnerability class (CWE-798) and the CVSS vector. No specific function names, endpoints, or file paths are invented.

1. Reconnaissance / Target Identification: An adversary identifies the Lenovo Health Android application (Chinese market distribution) and obtains the distributed APK package from a public or mirrored source.
2. Flaw Trigger (class-level): Using static analysis / reverse engineering of the APK, the attacker inspects the application for embedded hardcoded credentials. Because CWE-798 concerns credentials baked into the distributed artifact, they are recoverable without runtime execution of the target's protected services — no authentication is required to read them (PR:N).
3. Execution / Credential Use: The recovered credential is then used against the associated backend service over the network (AV:N), impersonating the application or a legitimate service account. Since no user interaction is required (UI:N), the credential can be replayed silently.
4. Post-Exploitation Impact: With C:H/I:H, the attacker can read sensitive health-related information and potentially alter it. Health data carries regulatory weight (e.g., PIPL in China) and could support fraud, identity theft, or downstream targeting of exposed patients. No availability impact is expected (A:N).

Impact Assessment

• Business impact: Exposure of health-related personal information constitutes a major privacy and regulatory event, particularly under China's Personal Information Protection Law (PIPL). Reputational harm and notification obligations to affected users are likely.
• Affected systems: Deployments of the Lenovo Health Android application in the Chinese market and their supporting backend services. Because it is a client application, the "blast radius" extends to the backend APIs that trust the embedded credential.
• Blast radius: Potentially all users whose health data is processed by the affected service if a single embedded credential is shared across the deployment.
• CVSS subscores: AV:N, AC:L, PR:N, UI:N → trivially reachable attack path; C:H/I:H → severe data compromise; S:U → impact scoped to the vulnerable component; A:N → no uptime degradation.
• Exploitability context: EPSS is not yet scored by FIRST.org; no CISA KEV listing; no public PoC/exploit code, and no Nuclei template. These facts lower observed near-term exploitation likelihood but do not reduce severity — hardcoded credentials are typically trivial to extract once a binary is obtained.

Detection Guidance

Scope note: This CVE affects a client (Android) application. Network-side detections are therefore best-effort and target the backend credential-abuse behavior rather than the hardcoded secret itself. Content-based signatures reference application identity generically; no fabricated endpoint literals are used.

Sigma Rule

title: Potential Hardcoded Credential Abuse - Lenovo Health Application
id: 8f2a1c74-3b6e-4d21-9c0e-7a5d1e9b4c31
status: experimental
description: Detects anomalous authenticated access patterns potentially resulting
  from abuse of hardcoded credentials embedded in the Lenovo Health Android application
  (CVE-2026-75940). Correlates user agent / client metadata indicating the Lenovo
  Health app performing bulk or off-hours data access.
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-75940
author: valtersit.com Threat Intelligence
date: 2026/01/01
tags:
  - attack.t1552
  - attack.t1213
  - cve.2026.75940
logsource:
  category: web
  product: generic
detection:
  selection_client:
    cs-user-agent|contains:
      - 'LenovoHealth'
      - 'Lenovo Health'
  selection_bulk:
    cs-uri-query|contains:
      - 'patient'
      - 'health'
      - 'record'
    sc-status: 200
  timeframe: 5m
  condition: selection_client and selection_bulk | count() by src_ip > 100
fields:
  - src_ip
  - cs-method
  - cs-uri-stem
  - cs-user-agent
level: medium
falsepositives:
  - Legitimate Lenovo Health application traffic with high sync volume

YARA Rule

rule CVE_2026_75940_Lenovo_Health_Hardcoded_Credential
{
    meta:
        description = "Detects embedded credential material in Lenovo Health Android
                       application artifacts consistent with CWE-798 (CVE-2026-75940)"
        author = "valtersit.com Threat Intelligence"
        date = "2026-01-01"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-75940"
        cve = "CVE-2026-75940"

    strings:
        $app = "Lenovo Health" ascii wide nocase
        $pkg = "com.lenovo.health" ascii nocase
        $cred1 = "api_key" ascii nocase
        $cred2 = "secret" ascii nocase
        $cred3 = "client_secret" ascii nocase
        $cred4 = "password" ascii nocase
        $cred5 = "Authorization: Bearer" ascii nocase

    condition:
        uint32(0) == 0x04034b50 or uint32(0) == 0x504b0304 and
        (
            ($app or $pkg) and any of ($cred*)
        )
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-75940 Possible Lenovo Health Hardcoded Credential Abuse"; flow:established,to_server; http.user_agent; content:"LenovoHealth"; nocase; http.header; content:"Authorization"; nocase; threshold: type both, track by_src, count 100, seconds 300; classtype:credential-theft; reference:cve,2026-75940; sid:2026759401; rev:1;)

Elastic Detection

sequence by source.ip with maxspan=5m
  [ network where network.protocol == "http" and
      http.request.headers.user_agent : "*Lenovo Health*" ]
  [ network where http.request.method in ("GET","POST") and
      http.response.status_code == 200 and
      (url.query : "*patient*" or url.query : "*health*" or url.query : "*record*") ]

Splunk SPL Query

index=web (cs_UserAgent="*Lenovo Health*" OR cs_UserAgent="*LenovoHealth*")
  (cs_uri_query="*patient*" OR cs_uri_query="*health*" OR cs_uri_query="*record*")
  sc_status=200
| bin _time span=5m
| stats count dc(cs_uri_stem) as endpoints values(cs_uri_stem) as paths by src_ip _time
| where count > 100 OR endpoints > 20
| sort - count

Wazuh OSSEC Rule

<group name="lenovo,cve-2026-75940,credential-abuse,">
  <rule id="2026751" level="10">
    <decoded_as>json</decoded_as>
    <field name="user_agent">Lenovo ?Health</field>
    <description>CVE-2026-75940: Lenovo Health app client activity detected - possible hardcoded credential abuse</description>
    <mitre>
      <id>T1552</id>
    </mitre>
  </rule>
  <rule id="2026752" level="12">
    <if_sid>2026751</if_sid>
    <field name="status">200</field>
    <field name="uri" type="pcre2">(?i)(patient|health|record)</field>
    <description>CVE-2026-75940: Lenovo Health app accessed sensitive health data path</description>
    <mitre>
      <id>T1213</id>
    </mitre>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED) — no patch, vendor advisory, or fix reference is available from any tracked source. Treat as unpatched until Lenovo publishes an official advisory.

1. Immediate mitigations:
   • Restrict backend service access for credentials believed to be embedded in the application; rotate any credential material associated with the Lenovo Health application immediately.
   • On managed Android fleets, consider blocking or restricting installation of the affected application until a vendor fix is confirmed.
   • Apply network egress controls to limit where the application (and any abused credential) can reach.
2. Patch / upgrade steps: No patched version identifier is available. Monitor Lenovo's official advisory channels and the CVE/NVD record for a fixed version reference. Do not assume any current version is fixed.
3. Long-term hardening:
   • Eliminate hardcoded credentials by moving secrets to runtime-provided, per-user, or short-lived tokens issued by a secure identity service (remediate CWE-798 at the architecture level).
   • Require device attestation and per-user authentication for health-data backend access rather than a shared embedded secret.
   • Add SAST/secret-scanning gates in the mobile build pipeline to prevent recurrence.

References

1. NVD — CVE-2026-75940: https://nvd.nist.gov/vuln/detail/CVE-2026-75940
2. CWE-798 — Use of Hard-Coded Credentials: https://cwe.mitre.org/data/definitions/798.html
3. FIRST.org EPSS (CVE not yet scored): https://api.first.org/data/v1/epss?cve=CVE-2026-75940
4. MITRE ATT&CK T1552 — Unsecured Credentials: https://attack.mitre.org/techniques/T1552/
5. Lenovo Product Security Advisories (monitor for published fix): https://www.lenovo.com/us/en/product-security/

Threat actor / in-the-wild status: No CISA KEV entry, no public PoC, no known exploit code, and no attributed threat-actor campaign were identified in the available data. All exploitation scenarios above are inferred from the vulnerability class; no active in-the-wild exploitation is confirmed.