CVE-2026-1759

Executive Summary

CVE-2026-1759 is a privilege escalation vulnerability in Secomea GateManager, an industrial remote access and secure connectivity gateway used to reach OT/ICS assets and production networks. The flaw is an improper handling of insufficient permissions or privileges (CWE-280) that allows an authenticated low-privilege user to escalate to a higher privilege level. Affected versions are GateManager 11.4.x (below build 11.4.626194074) and 11.5.x. A fixed version is available as 11.6 or 11.4.626194074 and above.

The vulnerability carries a CVSS v3.1 base score of 6.5 (Medium). Because GateManager often sits at the trust boundary between IT and OT environments, successful privilege escalation can give an attacker broad visibility and control over connected industrial endpoints.

Technical Analysis

CVE-2026-1759 belongs to the vulnerability class described by CWE-280: Improper Handling of Insufficient Permissions or Privileges. The NVD description states plainly: "Improper handling of insufficient permissions or privileges vulnerability in Secomea GateManager allows Privilege Escalation."

The essential mechanism is a missing or faulty authorization check. The application exposes functionality — a management action, configuration surface, or administrative interface — that should require elevated privileges, but does not correctly enforce the caller's permission level. An actor who already holds a valid low-privilege session can invoke that functionality and obtain rights they were never granted.

CVSS v3.1 vector analysis (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N) constrains the picture precisely:

• AV:N (Network): The vulnerable component is reachable over the network; no physical or adjacent-network positioning is required.
• AC:L (Low): No special conditions, race windows, or unusual configurations are needed to trigger the flaw.
• PR:L (Low): The attacker must already possess some valid credentials — this is privilege escalation, not unauthenticated access.
• UI:N (None): No victim interaction is required.
• S:U (Unchanged): Exploitation stays within the same security authority; the vulnerable component's scope does not expand.
• C:H: The confidentiality impact is rated High — escalated access can expose sensitive data, configuration, or credentials.
• I:N / A:N: The published vector assigns no direct integrity or availability impact, indicating the primary confirmed consequence is unauthorized information exposure enabled by the elevated access.

The specific affected endpoint, request parameter, or code path is not disclosed in the available intelligence. Per accuracy constraints, no function names, API routes, or parameter names should be assumed. The reliable characterization is: an authorization-enforcement defect that fails to block a lower-privileged principal from performing privileged actions.

The affected build range is explicitly listed: GateManager 11.5;0 and 11.4.625515072:0, with remediation in 11.6 or 11.4.626194074 and above. The precise build numbers indicate a coordinated maintenance release rather than an emergency out-of-band fix.

Exploitation Scenarios

No public proof-of-concept, exploit code, or Nuclei template is available for CVE-2026-1759. The attack chain below is inferred from the vulnerability class (CWE-280 privilege escalation) and the CVSS vector, not from observed exploit artifacts.

1. Reconnaissance / target identification. An attacker identifies internet- or network-exposed Secomea GateManager instances, for example through Shodan queries such as product:"Secomea GateManager" or certificate-based searches (ssl.cert.subject.cn:"secomea.com"). Version fingerprinting (11.4.x below 11.4.626194074, or 11.5.x below 11.6) confirms exposure to the vulnerable range.

2. Prerequisite access. The PR:L metric means the adversary must already hold a valid low-privilege account. Common real-world sources include compromised vendor/partner accounts, contractor or operator credentials, or a previously established foothold on the appliance. This reconnaissance and access-primitive phase maps to T1078 (Valid Accounts).

3. Triggering the flaw. — The attacker authenticates with the low-privilege account and reaches a privileged function that the application fails to protect. Because of the improper permission handling, the authorization check does not prevent the low-privileged principal from performing that action or assuming the higher-privileged role. The exact request structure is undisclosed; the operative condition is the absent or defective privilege check, not a crafted payload.

4. Post-exploitation impact. Per the CVSS assessment, confidentiality is the highest-rated impact (C:H): the escalated access lets the attacker read information otherwise restricted to administrators — device configurations, connected endpoint inventories, session data, or credentials that broaden the foothold. The published score records no integrity or availability impact, so destructive effects are not the assessed primary outcome; however, access to administration surfaces in an OT remote-access gateway materially widens the attack surface against managed industrial devices.

5. Lateral movement. In a typical Secomea deployment, GateManager brokers connections to SiteManager units and downstream PLCs/HMIs. Elevated access on the GateManager increases the risk of reach into those linked industrial environments (T1021 — Remote Services).

Impact Assessment

• Business impact: GateManager is a connectivity backbone for remote maintenance of industrial control systems. Privilege escalation on this appliance threatens the confidentiality of OT network topology, device credentials, and maintenance sessions. For regulated operators (manufacturing, energy, water, transport), such exposure can carry compliance and safety consequences.
• Affected systems: Secomea GateManager 11.4.x below build 11.4.626194074 and 11.5.x below 11.6. Downstream SiteManager units and connected OT endpoints are indirectly in scope as reachable assets.
• Blast radius: Scope is Unchanged (S:U), so the flaw's direct impact is contained to the GateManager security authority. The PR:L requirement limits exposure to parties already holding valid low-privilege accounts, reducing unauthenticated attack surface. Combined with network accessibility (AV:N, AC:L), this is a realistic insider or compromised-credential escalation path.
• Exploitability posture: EPSS 0.00259 (~17.7th percentile), no CISA KEV listing, no public PoC. There is currently no evidence of active exploitation in the wild. Severity is Medium (6.5); priority should be driven by the exposure of the appliance and the sensitivity of connected OT assets, not by current exploitation activity.

Detection Guidance

Detection should focus on authorization-failure anomalies and anomalous privileged operations by low-privilege sessions. Because the vulnerable endpoint and parameter names are undisclosed, the rules below target behavioral and class-level signals rather than a specific request signature.

Sigma Rule

title: Potential Secomea GateManager Privilege Escalation (CVE-2026-1759)
id: 8f3c1d20-1759-4a1b-9c7e-secomea0001
status: experimental
description: Detects authorization failures and privileged actions from low-privilege GateManager sessions consistent with CWE-280 privilege escalation.
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-1759
author: valtersit.com
date: 2026-01-01
logsource:
  product: webserver
  service: secomea_gatemanager
detection:
  selection:
    EventType:
      - 'authorization_failure'
      - 'privilege_escalation'
      - 'access_denied'
    User:
      - '*'
  condition: selection
level: high
tags:
  - attack.privilege_escalation
  - attack.t1068
  - cve.2026.1759

YARA Rule

rule CVE_2026_1759_Secomea_GateManager_PrivEsc
{
    meta:
        description = "Detects Secomea GateManager artifacts referencing the vulnerable privilege-escalation build range"
        author = "valtersit.com"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-1759"
        date = "2026-01-01"
        severity = "medium"
    strings:
        $vuln1 = "11.4.625515072" ascii
        $vuln2 = "GateManager" ascii nocase
        $cwe   = "privilege escalation" ascii nocase
        $priv  = "insufficient privileges" ascii nocase
    condition:
        $vuln2 and ($vuln1 or $cwe or $priv)
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-1759 Secomea GateManager Privilege Escalation Attempt"; flow:established,to_server; http.host; content:"GateManager"; http.uri; content:"/"; http.response_code; content:"403"; threshold:type both, track by_src, count 20, seconds 60; classtype:attempted-user; reference:cve,2026-1759; sid:20261759; rev:1;)

Note: The detection strategy targets repeated authorization-failure responses (HTTP 403) from a single source toward the GateManager management interface — the behavioral signature most consistent with CWE-280 privilege-escalation probing. Adjust http.host content to the deployed instance hostname.

Elastic Detection

sequence by source.ip with maxspan=5m
  [ network where network.protocol == "http" and http.response.status_code == 403 ]
  [ network where network.protocol == "http" and http.request.method in ("POST", "PUT") and url.path : "*" ]

Note: This EQL sequence flags a low-privilege session that first accumulates authorization denials and then issues state-changing privileged requests — a pattern consistent with privilege-escalation attempts against CVE-2026-1759.

Splunk SPL Query

index=web OR index=proxy sourcetype=*access*
"GateManager"
| eval status=coalesce(status, http_status, response_code)
| where status=403
| stats count, values(uri_path) as paths by src_ip, user
| where count > 20
| table src_ip, user, count, paths

Note: Replace index/sourcetype and field names to match your log schema. The query surfaces sources generating an anomalous volume of authorization failures against the GateManager interface.

Wazuh OSSEC Rule

<group name="secomea_gatemanager,">
  <rule id="1001759" level="10">
    <decoded_as>json</decoded_as>
    <field name="product">GateManager</field>
    <field name="event_type">authorization_failure</field>
    <description>CVE-2026-1759: Possible Secomea GateManager privilege escalation - repeated authorization failures</description>
    <mitre>
      <id>T1068</id>
    </mitre>
    <group>privilege_escalation,</group>
  </rule>
</group>

Note: Adjust decoded_as and field names to match your GateManager log ingestion format.

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source). No entry appears in the tracked patch sources, no vendor fix link, and no workaround is documented in the provided intelligence. Despite that, the NVD description itself states the fixed versions, which should be treated as the authoritative remediation target.

1. Immediate mitigations

• Restrict network exposure of the GateManager management interface using firewall rules and allowlists; do not expose it to the public internet where avoidable.
• Enforce least privilege on GateManager accounts: audit for stale, over-provisioned, or shared credentials (the PR:L requirement means existing accounts are the attack primitive).
• Enable MFA and centralized logging on all GateManager logins; alert on repeated authorization failures per the detection rules above.
• Monitor for credential misuse and anomalous session activity, since no signature-based detection exists for the exact endpoint.

2. Patch / upgrade steps

• Upgrade GateManager to 11.6 or to 11.4.626194074 and above, per the NVD description.
• Verify the running build matches or exceeds 11.4.626194074 for the 11.4 line; the affected build identified is 11.4.625515072 (and 11.5;0).
• After upgrading, re-validate permissions on administrative accounts and rotate credentials that may have been exposed during any pre-patch window.

3. Long-term hardening

• Segment GateManager and its managed OT devices from general IT networks; enforce one-way flows where possible.
• Adopt role-based access control reviews and periodic certification of every account that can reach the appliance.
• Track Secomea security advisories and CISA ICS advisories for this product line; add the appliance version to asset inventory so future build-range advisories (like this one) can be matched quickly.
• Prioritize by exposure: assets reachable from untrusted networks and those with many downstream OT endpoints should be remediated first.

References

1. NVD — CVE-2026-1759: https://nvd.nist.gov/vuln/detail/CVE-2026-1759
2. CWE-280 — Improper Handling of Insufficient Permissions or Privileges: https://cwe.mitre.org/data/definitions/280.html
3. Secomea GateManager product security/advisory page (vendor): https://www.secomea.com/
4. CISA Known Exploited Vulnerabilities Catalog (check for future addition): https://www.cisa.gov/known-exploited-vulnerabilities-catalog
5. MITRE ATT&CK T1068 — Exploitation for Privilege Escalation: https://attack.mitre.org/techniques/T1068/

Threat actor / exploitation status: No public PoC, no exploit code, no Nuclei template, and no CISA KEV listing were identified for CVE-2026-1759. EPSS is 0.00259 (~17.7th percentile), indicating low near-term exploitation likelihood based on current evidence. No threat-actor campaigns or in-the-wild exploitation are associated with this CVE in the available data. The attack chain presented is inferred from the vulnerability class (CWE-280) and CVSS vector; no implementation-specific details should be assumed beyond those stated in the NVD description.