CVE-2026-20289 Overview
CVE-2026-20289 is an information disclosure vulnerability in the logging subsystem of Cisco RoomOS. The flaw allows an authenticated, local attacker with low privileges to access sensitive information written to system logs. Exploitation requires the attacker to enable a specific logging level and then collect the generated system logs. Successful exploitation exposes sensitive data, including user login credentials, to the attacker. The weakness is classified as [CWE-532] Insertion of Sensitive Information into Log File.
Critical Impact
An authenticated local attacker can harvest user login credentials from Cisco RoomOS system logs after enabling a specific logging level.
Affected Products
- Cisco RoomOS (see the Cisco Security Advisory for affected versions)
- Cisco collaboration endpoints running RoomOS software
- Cisco Webex Room and Desk series devices using RoomOS
Discovery Timeline
- 2026-08-05 - CVE-2026-20289 published to NVD
- 2026-08-05 - Last updated in NVD database
Technical Details for CVE-2026-20289
Vulnerability Analysis
The vulnerability resides in the logging subsystem of Cisco RoomOS. When a specific logging level is enabled, the subsystem writes sensitive information, including user login credentials, into system log files. Any authenticated user with sufficient privileges to enable that logging level and read the logs can recover the exposed data. The exposure is limited to confidentiality; integrity and availability of the device are not affected. This weakness maps to [CWE-532] Insertion of Sensitive Information into Log File.
Root Cause
The root cause is improper handling of sensitive data by the RoomOS logging component. Credential material is written in clear form to logs when a particular verbosity level is active. The logging subsystem does not filter, mask, or redact secrets before they are persisted, so any reader of the log can view them.
Attack Vector
Exploitation requires an authenticated session on the RoomOS device with permissions to configure logging and retrieve system logs. The attacker enables the vulnerable logging level, waits for login events or related activity to populate the log, and then collects the log data. User interaction is required, meaning a legitimate user must authenticate while the elevated logging level is active for credentials to be captured.
No verified exploit code is publicly available. See the Cisco Security Advisory for technical details.
Detection Methods for CVE-2026-20289
Indicators of Compromise
- Configuration changes that raise the RoomOS logging verbosity to the affected level without a documented change request.
- Unexpected access, export, or download of RoomOS system logs by low-privileged accounts.
- Presence of credential-like strings, tokens, or authentication material inside collected RoomOS log files.
Detection Strategies
- Audit RoomOS administrative activity for commands or API calls that modify logging levels.
- Review historical log exports for cleartext credentials and rotate any secrets found.
- Correlate authentication events on RoomOS endpoints with log-access events from the same accounts.
Monitoring Recommendations
- Alert on any change to RoomOS logging configuration, especially transitions to verbose or debug levels.
- Monitor egress of log bundles from RoomOS devices to unusual destinations or user accounts.
- Track privileged session activity on collaboration endpoints and forward audit records to a central SIEM for correlation.
How to Mitigate CVE-2026-20289
Immediate Actions Required
- Apply the fixed RoomOS software release identified in the Cisco Security Advisory as soon as it is available in your environment.
- Disable the vulnerable logging level on RoomOS devices until patching is complete.
- Rotate any user credentials that may have been captured in existing log data, then securely purge affected log files.
- Restrict administrative and log-access privileges on RoomOS devices to a minimal set of trusted accounts.
Patch Information
Cisco has published guidance for this issue in the Cisco Security Advisory cisco-sa-roomos-infodisc-qBXjfmWm. Consult the advisory for fixed RoomOS versions and upgrade paths applicable to your deployed endpoints.
Workarounds
- Keep RoomOS logging at the default verbosity and avoid enabling the specific level that triggers credential logging.
- Limit access to log collection interfaces to administrators who require it for troubleshooting.
- Store and transmit collected RoomOS logs only over encrypted channels and enforce access controls on log repositories.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
