CVE-2026-8482 Overview
CVE-2026-8482 is an information disclosure vulnerability in Stormshield Network Security (SNS) firewalls. The flaw exists in the CLI command line tool, which can log or expose administration command arguments in a location accessible to other authenticated users. An attacker with SSH access to the firewall, when SSH multiuser mode is enabled, can retrieve secret material such as the proxy Certificate Authority (CA) passphrase or the Trusted Platform Module (TPM) password. The weakness is classified as insertion of sensitive information into log file [CWE-532].
Critical Impact
An authenticated adjacent attacker with SSH access can obtain the proxy CA passphrase or TPM password, undermining the confidentiality of firewall-managed secrets.
Affected Products
- Stormshield Network Security 4.3.0 through 4.3.41 (inclusive)
- Stormshield Network Security 4.8.0 through 4.8.15 (inclusive)
- Stormshield Network Security 5.0.0 through 5.0.5 (inclusive)
Discovery Timeline
- 2026-07-02 - CVE-2026-8482 published to the National Vulnerability Database (NVD)
- 2026-07-02 - Last updated in NVD database
Technical Details for CVE-2026-8482
Vulnerability Analysis
The vulnerability resides in how the Stormshield CLI utility handles administration commands. When administrators invoke the CLI tool with sensitive arguments, those arguments can be persisted in a log or process-visible location. Any local user session on the firewall can subsequently read that material.
The impacted secrets include the proxy CA passphrase used to sign intercepted TLS traffic and the TPM password protecting hardware-backed keys. Disclosure of either credential enables an attacker to decrypt intercepted proxy traffic or unlock TPM-sealed material. The exposure requires SSH multiuser mode to be enabled and an existing SSH session on the appliance.
Root Cause
The root cause is insertion of sensitive information into a log or shared resource [CWE-532]. The CLI accepts secrets as command-line parameters that are recorded or made observable to other authenticated shell users. Secret arguments were not routed through a channel isolated from process listings, history files, or logs.
Attack Vector
Exploitation requires an adjacent network position with valid, high-privilege SSH access to the firewall while SSH multiuser mode is enabled. User interaction is also required, meaning an administrator must have executed the affected CLI command with the sensitive argument. The attacker then reads the exposed data to recover the proxy CA passphrase or TPM password. No exploit code has been publicly published, and the issue is not listed on the CISA Known Exploited Vulnerabilities catalog.
Refer to the Stormshield Security Advisory 2025-007 for technical details from the vendor.
Detection Methods for CVE-2026-8482
Indicators of Compromise
- Unexpected SSH sessions on the SNS appliance from accounts other than the primary administrator while SSH multiuser mode is enabled.
- Access to CLI history files, process listings, or log files containing administration command invocations with credential arguments.
- Anomalous reads of files that store command traces on the firewall filesystem.
Detection Strategies
- Audit SSH authentication logs on Stormshield appliances for concurrent sessions and unauthorized user logins.
- Review shell history and CLI audit logs for administration commands executed with inline secret arguments such as proxy CA or TPM parameters.
- Correlate CLI invocations by administrators with subsequent file or process access performed by non-administrator SSH users.
Monitoring Recommendations
- Forward SNS system and SSH logs to a centralized log platform and alert on multiuser SSH activity.
- Monitor for any use of the proxy CA passphrase or TPM password outside expected administrative workflows.
- Track configuration changes that enable SSH multiuser mode and require change approval before activation.
How to Mitigate CVE-2026-8482
Immediate Actions Required
- Upgrade Stormshield Network Security to a fixed release above 4.3.41, 4.8.15, or 5.0.5 as published in Stormshield Security Advisory 2025-007.
- Disable SSH multiuser mode on SNS appliances unless it is strictly required for operations.
- Rotate the proxy CA passphrase and TPM password on any appliance where the CLI command was executed while multiple SSH users had access.
Patch Information
Stormshield has released fixed firmware versions addressing CVE-2026-8482. Refer to Stormshield Security Advisory 2025-007 for the specific patched builds for the 4.3.x, 4.8.x, and 5.0.x branches, and apply the update following the vendor upgrade procedure.
Workarounds
- Restrict SSH access to the firewall to a single administrative account and disable SSH multiuser mode.
- Avoid passing secrets such as the proxy CA passphrase or TPM password as CLI arguments until the patch is applied.
- Enforce strict least privilege on any local accounts on the appliance and remove unused SSH keys and users.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
