CISA Advisory: OpenCode Systems OC Messaging and USSD Gateway Vulnerability
Summary
CISA has issued an advisory regarding a critical vulnerability (CVE-2025-70614) in OpenCode Systems OC Messaging and USSD Gateway versions 6.32.2. Successful exploitation could allow an authenticated low-privileged user to gain unauthorized access to SMS messages. OpenCode Systems has released version 6.33.11 to address the vulnerability.
What changed
CISA has released an advisory (ICSA-26-085-02) detailing a critical improper access control vulnerability (CVE-2025-70614) affecting OpenCode Systems OC Messaging and USSD Gateway versions 6.32.2. The vulnerability, with a CVSS v3.1 base score of 8.1, allows an authenticated low-privileged user to access SMS messages outside their authorized tenant scope by crafting a company or tenant identifier parameter. This could lead to unauthorized disclosure of sensitive information.
OpenCode Systems identified the vulnerability on January 5, 2026, and released version 6.33.11 on January 6, 2026, to remediate the issue. CISA recommends organizations using the affected versions implement defensive measures, including minimizing network exposure, isolating control system devices, and ensuring remote access uses secure methods like updated VPNs. Organizations should perform impact analysis and risk assessments before deploying mitigations.
What to do next
- Update OpenCode Systems OC Messaging and USSD Gateway to version 6.33.11
- Minimize network exposure for affected systems
- Implement secure remote access methods, such as updated VPNs
Source document (simplified)
ICS Advisory
OpenCode Systems OC Messaging and USSD Gateway
Release Date
March 26, 2026
Alert Code ICSA-26-085-02 Related topics: Industrial Control System Vulnerabilities, Industrial Control Systems View CSAF
Summary
Successful exploitation of this vulnerability could allow an authenticated low-privileged user to gain access to SMS messages outside of their authorized tenant scope via a crafted company or tenant identifier parameter.
The following versions of OpenCode Systems OC Messaging and USSD Gateway are affected:
- OC Messaging 6.32.2 (CVE-2025-70614)
- USSD Gateway 6.32.2 (CVE-2025-70614)
| CVSS | Vendor | Equipment | Vulnerabilities |
| --- | --- | --- | --- |
| v3 8.1 | OpenCode Systems | OpenCode Systems OC Messaging and USSD Gateway | Improper Access Control |
Background
- Critical Infrastructure Sectors: Communications
- Countries/Areas Deployed: Worldwide
- Company Headquarters Location: Bulgaria
Vulnerabilities
CVE-2025-70614
OpenCode Systems Custom Messaging Gateway 6.32.2 contains a web access vulnerability allowing one authenticated user to gain access to another authenticated user's messages via a crafted identifier parameter.
Affected Products
OpenCode Systems OC Messaging and USSD Gateway
Vendor:
OpenCode Systems Product Version:
OpenCode Systems OC Messaging: 6.32.2, OpenCode Systems USSD Gateway: 6.32.2 Product Status:
known_affected
Remediations
Mitigation
The vulnerability was identified by OpenCode Systems on January 5, 2026 and remediated on January 6, 2026 with the release of version 6.33.11.
Mitigation
For more information, contact OpenCode: https://opencode.com/about/contact-us
https://opencode.com/about/contact-us
Relevant CWE: CWE-284 Improper Access Control
Metrics
| CVSS Version | Base Score | Base Severity | Vector String |
| --- | --- | --- | --- |
| 3.1 | 8.1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
Acknowledgments
- Hussein Amer reported this vulnerability to CISA
Legal Notice and Terms of Use
This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).
Recommended Practices
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability.
Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
Locate control system networks and remote devices behind firewalls and isolating them from business networks.
When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
CISA also recommends users take the following measures to protect themselves from social engineering attacks:
Do not click web links or open attachments in unsolicited email messages.
Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.
No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.
Revision History
- Initial Release Date: 2026-03-26
| Date | Revision | Summary |
| --- | --- | --- |
| 2026-03-26 | 1 | Initial Publication |
Legal Notice and Terms of Use
This product is provided subject to this Notification and this Privacy & Use policy.
Tags
Sector: Communications Sector Topics: Industrial Control System Vulnerabilities, Industrial Control Systems
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