CVE-2026-1758 Overview
CVE-2026-1758 is a session fixation vulnerability [CWE-384] in the webserver module of Secomea GateManager. The flaw affects GateManager versions 11.5;0 and 11.4.625515072:0. Secomea has released fixed versions 11.6 and 11.4.626194074 to address the issue.
An attacker can exploit this vulnerability over the network by tricking a user into authenticating with an attacker-controlled session identifier. Successful exploitation allows the attacker to hijack the authenticated session and gain unauthorized access to the GateManager interface.
Critical Impact
Successful session fixation attacks against GateManager can grant attackers full access to industrial remote-access infrastructure, exposing connected OT and IoT devices.
Affected Products
- Secomea GateManager version 11.5;0
- Secomea GateManager version 11.4.625515072:0
- Deployments not upgraded to 11.6 or 11.4.626194074
Discovery Timeline
- 2026-09-15 - CVE-2026-1758 published to the National Vulnerability Database
- 2026-09-15 - Last updated in NVD database
Technical Details for CVE-2026-1758
Vulnerability Analysis
The vulnerability resides in the webserver module of Secomea GateManager, an industrial remote access platform used to connect field devices and operators. The webserver reuses a pre-existing session identifier through the authentication transition rather than issuing a fresh identifier after successful login. This behavior classifies as session fixation under [CWE-384].
An attacker can pre-set a session identifier in a victim's browser, then wait for the victim to authenticate. Because the identifier persists across the login boundary, the attacker retains a valid authenticated session tied to the victim's credentials. From there, the attacker gains access to management functions exposed by GateManager, including remote device connections.
Exploitation requires user interaction, typically through a crafted link or a page that plants the fixed session cookie. No prior privileges on GateManager are required.
Root Cause
The root cause is the failure of the webserver module to invalidate or rotate session identifiers after a privilege boundary change. Secure session management requires generating a new session token after successful authentication. GateManager retained the pre-authentication token, allowing an externally supplied identifier to remain valid post-login.
Attack Vector
The attack proceeds over the network against the GateManager web interface. An attacker obtains or generates a session identifier from the GateManager server. The attacker then delivers this identifier to the victim through a phishing link, a cross-site scripting payload on a related domain, or another cookie-planting technique. When the victim authenticates, the attacker's session becomes authenticated with the victim's privileges.
No verified public exploit code is available. See the Secomea Cybersecurity Advisory for vendor guidance.
Detect Identity Attacks the Moment Authentication Fails
Singularity™ Identity surfaces credential misuse, lateral movement, and privilege escalation in real time, so you can contain the breach before it spreads.
Stop Identity AttacksDetection Methods for CVE-2026-1758
Indicators of Compromise
- Multiple concurrent GateManager sessions sharing the same session identifier from different source IP addresses or user agents.
- Session identifiers appearing in GateManager access logs before their corresponding successful authentication events.
- Unexpected administrative actions or device connection requests from previously idle user accounts.
Detection Strategies
- Correlate authentication events with subsequent session activity to identify sessions where the identifier predates the login timestamp.
- Inspect web server access logs for Set-Cookie reuse across pre- and post-authentication requests.
- Monitor for anomalous geolocation or ASN changes within a single authenticated GateManager session.
Monitoring Recommendations
- Forward GateManager access and authentication logs to a centralized SIEM for behavioral correlation.
- Alert on sessions that transition from unauthenticated to authenticated states without a session identifier change.
- Track administrative operations against baseline user behavior to surface hijacked accounts.
How to Mitigate CVE-2026-1758
Immediate Actions Required
- Upgrade Secomea GateManager to version 11.6 or 11.4.626194074 or later.
- Terminate all active GateManager sessions after upgrading to force reauthentication with rotated session identifiers.
- Audit administrative accounts for unauthorized configuration or device access changes.
- Restrict GateManager web interface exposure to trusted networks or VPN-protected segments.
Patch Information
Secomea has addressed CVE-2026-1758 in GateManager versions 11.6 and 11.4.626194074. Administrators should consult the Secomea Cybersecurity Advisory for release notes and upgrade instructions. Apply the patch during a scheduled maintenance window and validate the fixed version via the administrative console after upgrade.
Workarounds
- Enforce network-level access controls that restrict GateManager web access to a limited set of trusted IP addresses.
- Require multi-factor authentication for GateManager accounts to reduce the value of a hijacked session.
- Configure short session timeout intervals to limit the window of exploitation until the patch is applied.
# Example: restrict GateManager web access at the network edge
# Replace with your firewall syntax and trusted management CIDR
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
