CVE-2026-50603

Executive Summary

CVE-2026-50603 is a use of a hard-coded cryptographic key (CWE-321) in the Acer Agent Service component shipped with Acer's NitroSense and PredatorSense gaming-utility suites. The AES key is embedded in the software, and per the NVD description a local attacker may be able to recover and reuse it to access protected information or perform unauthorized actions within the service's trust boundary. The flaw affects end-user workstations and gaming laptops where these utilities are installed; no CVSS score, EPSS score, public proof-of-concept, or vendor patch is currently available.

Technical Analysis

The vulnerability class is CWE-321, use of a hard-coded cryptographic key. Per the NVD description, the Acer Agent Service component bundled with NitroSense and PredatorSense "is caused by the use of a hard-coded AES encryption key within the software." Two facts are therefore established by the source data: (1) the cryptographic primitive in scope is AES, and (2) the key material is static and shipped inside the product rather than generated per-installation, per-device, or per-session.

Because the key is embedded in software distributed to every installation, it is not a secret from any party who can read the binaries, config, or resources of the Acer Agent Service. An attacker with local read access to the installation can recover the key through static inspection of the component files. No specific file paths, function names, registry keys, service names, or IPC endpoints are disclosed in the CNA/NVD text, so the precise location of the embedded key cannot be asserted here; it is a property of the shipped component as a whole.

The security consequence follows from what the AES key protects. Hard-coded keys are typically used to encrypt configuration blobs, locally cached data, inter-process messages, or to authenticate a client to the service. Whichever of these applies, the effect is the same: confidentiality and integrity guarantees that depend on the key become unenforceable, because the key is known to the attacker. This maps to the CWE-321 parent problem: "the product uses a hard-coded cryptographic key, which can allow attackers to recover the key and decrypt or forge protected data."

The attack surface is local. The NVD text explicitly states "a local attacker," which implies the adversary must already have code execution or an interactive session on the host — for example a non-privileged user, a malicious local process, or an attacker who has achieved initial access via another vector (phishing, malvertising, or a compromised dependency). The flaw does not by itself provide remote ingress; it is a privilege-escalation and/or data-access enabler within the local trust boundary. NitroSense and PredatorSense are consumer gaming utilities, so deployment is concentrated on Acer gaming laptops and desktops rather than managed enterprise server fleets or data-center infrastructure.

Exploitation Scenarios

No public PoC, exploit code, or Nuclei template exists for this CVE. The following chain is inferred strictly from the vulnerability class (CWE-321) and the NVD description; specific code patterns, file names, and endpoints are not available and are deliberately not fabricated.

1. Reconnaissance / target identification. The attacker must already have local access to a host running NitroSense or PredatorSense with the Acer Agent Service component present. Reconnaissance therefore consists of confirming the presence of the utility and its service component on the target host, and identifying the installation directory and any configuration, cache, or message data that the service protects.

2. Key recovery (triggering the flaw). Because the AES key is hard-coded in shipped software, the attacker inspects the Acer Agent Service binaries and associated resources on disk to locate the static key material. This is the direct consequence of CWE-321: the key is present in the distribution and is not derived from a device-unique secret, so it is recoverable by any local reader of the component. No exploitation of a memory-safety bug or logic bug is required — the weakness is the presence of the key itself.

3. Payload/execution at the vulnerability-class level. With the AES key in hand, the attacker can decrypt data that the service encrypted with that key, and — because AES in a static-key scheme is symmetric — can also craft or modify data that the service will accept as authentic. The unauthorized action is whatever the service authorizes based on possession of the key: reading protected information, or submitting forged/replayed content that the service treats as legitimate. The exact protected objects and accepted operations are not enumerated in the available description.

4. Post-exploitation impact. The NVD text states the attacker may "access protected information or perform unauthorized actions." Practical outcomes include disclosure of locally protected data and integrity violations against the service's state or the actions it mediates. Because the key is identical across installations until patched, a key recovered from one system may be reusable against other systems running the same software build, which raises the value of a single successful recovery and creates a population-wide exposure dimension.

Impact Assessment

CVSS is not assigned (NVD reports N/A), and FIRST.org has not yet scored this CVE for EPSS. The vector provided in the metadata line above is an analyst-derived appraisal consistent with CWE-321 and a local attack precondition, not a vendor or NVD score; it should be treated as indicative only. Under that appraisal: AV:L (local access required), AC:L (recovering a static key requires no special conditions beyond read access), PR:L (an ordinary local user suffices; no administrative privilege is stated as necessary), UI:N (no victim interaction), S:U (impact remains within the service's security scope), C:H (protected information becomes readable), I:L (forged or modified input may be accepted), A:N (no direct availability impact described).

Business impact is concentrated in three areas. First, confidentiality of locally stored protected information — any data the Acer Agent Service encrypts with the embedded key should be considered exposed to any local user of the host. Second, integrity of service-mediated actions — because the symmetric key is shared, a local attacker can potentially influence the service's behavior in ways the design intended to prevent. Third, shared-key blast radius — a hard-coded key is not unique to one device, so the compromise of the key is effectively a compromise of the encryption scheme for the entire installed base of affected builds. The blast radius at the host level is a single endpoint, but the cryptographic exposure is fleet-wide. No CISA KEV listing exists and there is no evidence of exploit-in-the-wild or named threat-actor campaigns; this is a latent, local-only weakness rather than an actively exploited remote vulnerability.

Detection Guidance

Sigma Rule

title: Suspicious Access to Acer Agent Service Component Files
id: 7f3a9c2e-1b64-4d8a-9f21-50603aceragent
status: experimental
description: Detects local read access to NitroSense/PredatorSense Acer Agent Service installation files, consistent with static recovery of a hard-coded AES key (CVE-2026-50603).
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-50603
author: valtersit.com Threat Intelligence
date: 2026/01/01
logsource:
  category: file_access
  product: windows
detection:
  selection_path:
    FileName|contains:
      - 'NitroSense'
      - 'PredatorSense'
      - 'AcerAgent'
      - 'Acer Agent'
  selection_action:
    AccessType|contains:
      - 'ReadData'
      - 'Read'
  filter_vendor:
    Image|contains:
      - 'NitroSense'
      - 'PredatorSense'
  condition: selection_path and selection_action and not filter_vendor
falsepositives:
  - Legitimate vendor update / telemetry processes
  - Endpoint management software inventorying installed applications
level: medium
tags:
  - attack.t1552.001
  - cwe.321

YARA Rule

rule CVE_2026_50603_Acer_Hardcoded_AES_Key_Indicator
{
    meta:
        description = "Heuristic detection for Acer NitroSense/PredatorSense Agent Service binaries; flags embedded AES key material strings and AES crypto usage adjacent to Acerservice branding (CVE-2026-50603, CWE-321)"
        author = "valtersit.com Threat Intelligence"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-50603"
        date = "2026-01-01"
        severity = "medium"

    strings:
        $brand1 = "NitroSense" ascii wide nocase
        $brand2 = "PredatorSense" ascii wide nocase
        $brand3 = "Acer Agent Service" ascii wide nocase
        $aes1   = "AES" ascii wide
        $aes2   = "aes-256-cbc" ascii wide nocase
        $aes3   = "Rijndael" ascii wide nocase
        $key1   = "AES_KEY" ascii wide
        $key2   = "EncryptionKey" ascii wide
        $key3   = "StaticKey" ascii wide

    condition:
        (uint16(0) == 0x5A4D or uint32(0) == 0x464C457F) and
        filesize < 50MB and
        (any of ($brand*)) and
        (any of ($aes*)) and
        (1 of ($key*))
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-50603 - Possible Acer Agent Service Component Retrieval / Recon"; flow:established,to_client; http.user_agent; content:"NitroSense"; nocase; http.header; content:"Acer"; nocase; classtype:attempted-recon; sid:5060301; rev:1; reference:cve,2026-50603; reference:url,https://nvd.nist.gov/vuln/detail/CVE-2026-50603; metadata:created_at 2026_01_01, updated_at 2026_01_01;)

alert tcp any any -> any any (msg:"CVE-2026-50603 - Acer PredatorSense Update/Download Channel Activity"; flow:established,to_client; content:"PredatorSense"; nocase; content:"Acer"; nocase; classtype:policy-violation; sid:5060302; rev:1; reference:cve,2026-50603; metadata:created_at 2026_01_01;)

Elastic Detection

// Detects suspicious local reads of Acer Agent Service component files,
// consistent with static recovery of a hard-coded AES key (CVE-2026-50603 / CWE-321).
//
// NOTE: EQL operates over ECS-mapped endpoint events. If no file-access data source
// is deployed, pivot this to process/command telemetry that touches the utility's
// install paths (for example command shells, scripting hosts, or archivers reading
// NitroSense / PredatorSense directories).
//
// Sensitive indicators are expressed as substrings of the tool/product names
// disclosed by the vendor, not as verified file paths.

file where file.path != null and
    (
      file.path : "*NitroSense*" or
      file.path : "*PredatorSense*" or
      file.path : "*AcerAgent*" or
      file.path : "*Acer Agent*"
    ) and
    (
      file.Ext.header_bytes_read > 0 or
      file.Ext.header_bytes_read != null
    ) and
    not process.name : ("NitroSense*", "PredatorSense*", "AcerAgent*", "Acer*Service*")

Splunk SPL Query

index=endpoint (EventCode=4663 OR EventCode=4656 OR source="*Sysmon*" EventID=11 OR EventID=1)
| eval haystack=lower(coalesce(ObjectName, TargetFilename, Image, CommandLine, ProcessName, ""))
| where match(haystack, "(nitrosense|predatorsense|acer.?agent|acer.?service)")
| eval suspicious=case(
    match(haystack, "(powershell|pwsh|cmd\.exe|wscript|cscript|mshta|rundll32|7z|winrar|certutil)"), "high",
    match(haystack, "(read|open|access)"), "medium",
    true(), "low")
| stats count min(_time) as first_seen max(_time) as last_seen
        values(suspicious) as severity values(user) as users
        values(ProcessName) as processes
        by host haystack
| where severity="high" OR (severity="medium" AND count > 3)
| convert ctime(first_seen) ctime(last_seen)
| sort - count

Wazuh OSSEC Rule

<group name="acer,cve_2026_50603,">
  <rule id="506030" level="6">
    <if_sid>550</if_sid>
    <field name="file">NitroSense|PredatorSense|AcerAgent|Acer Agent</field>
    <description>CVE-2026-50603: Suspicious access to Acer Agent Service component (NitroSense/PredatorSense) - possible hard-coded AES key recovery</description>
    <mitre>
      <id>T1552.001</id>
    </mitre>
    <group>cwe_321,local_privesc,</group>
  </rule>

  <rule id="506031" level="8">
    <if_sid>506030</if_sid>
    <field name="process">powershell|pwsh|cmd.exe|wscript|cscript|mshta|rundll32|certutil</field>
    <description>CVE-2026-50603: Shell/scripting host reading Acer Agent Service files - likely static key extraction attempt</description>
    <mitre>
      <id>T1552.001</id>
    </mitre>
    <group>cwe_321,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source). No vendor fix, workaround, affected version range, or fixed version has been published in the sources tracked for this report.

1. Immediate mitigations.

   • Treat the hard-coded AES key as compromised. Assume any data that the Acer Agent Service encrypts with it is readable by any local user of an affected host, and that a key recovered from one host applies to every host running the same build.
   • If NitroSense/PredatorSense and the Acer Agent Service are not operationally required, uninstall or disable them. On managed gaming endpoints this removes the vulnerable component entirely.
   • Where the utilities must remain installed, restrict local interactive access to trusted users, and monitor for shell/scripting processes reading the utility's installation and data directories.
   • Since no explicit affected-version list is available, inventory hosts with these utilities and record installed builds so that a future advisory can be matched against the estate.
   • Do not store sensitive secrets in, or rely on, data that the Acer Agent Service encrypts on the local host.

2. Patch/upgrade steps.

   • No patch exists as of this report. Monitor Acer's support and security advisory channels for NitroSense and PredatorSense, and re-check NVD for this CVE as a CVSS score, affected-version range, and reference links are published.
   • When a vendor fix appears, validate it against the affected version range (currently unknown), update the utility through Acer's official channel, and — because AES keys are static — plan for key rotation or re-encryption of any protected data the newly patched version depends on.

3. Long-term hardening.

   • Require per-installation secrets: vendors should derive cryptographic keys from device-unique entropy (TPM-bound or OS keystore-backed) rather than compile-time constants; as a consumer, prefer software that does so and raise the issue with the vendor.
   • Maintain a software bill of materials for OEM utilities on laptops and gaming desktops so that hard-coded-credential findings can be traced to endpoints quickly.
   • Add detection coverage for local reads of vendor utility files by scripting hosts, as encoded in the detection rules above.
   • Apply least privilege on endpoint workstations so that local attackers cannot freely read arbitrary vendor installation directories.

References

• NVD — CVE-2026-50603: https://nvd.nist.gov/vuln/detail/CVE-2026-50603
• CWE-321: Use of Hard-coded Cryptographic Key — https://cwe.mitre.org/data/definitions/321.html
• MITRE ATT&CK T1552.001: Unsecured Credentials — Credentials In Files — https://attack.mitre.org/techniques/T1552/001/
• CISA Known Exploited Vulnerabilities Catalog (not listed for this CVE) — https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• Acer product support / security advisories — https://www.acer.com/us-en/support (monitor for NitroSense and PredatorSense fixes)

Threat-actor note: no named campaign, exploit-in-the-wild evidence, public PoC, or CISA KEV listing is associated with CVE-2026-50603 as of this report. The EPSS score has not been published by FIRST.org; no value is asserted here.