CVE-2026-54364 Gladinet CVE debrief

Who should care

Defenders responsible for CentreStack installations, security teams, and vulnerability management teams should assess exposure and prioritize patching to prevent unauthorized access. CentreStack operators and administrators should review and apply patches, monitor for suspicious activity, and verify CentreStack versions to ensure the security of management pages.

Why it matters

CVE-2026-54364 is a session variable injection vulnerability in CentreStack before version 17.4 that allows unauthenticated attackers to bypass authentication checks and gain unauthorized access to management pages. Defenders should prioritize verifying CentreStack versions and applying patches to prevent unauthorized access.

• Potential unauthorized access to management pages
• Bypassing of authentication checks
• Injection of arbitrary session variables
• Possible lateral movement within the network

Technical summary

The vulnerability allows unauthenticated attackers to inject arbitrary session variables by embedding newline and tab characters into a crafted AccountName parameter posted to the SelectProvider.aspx endpoint. This can be used to bypass the IsValidRSession authentication check and gain unauthorized access to management pages in CentreStack before version 17.4. The custom session serialization format lacks input sanitization, enabling attackers to inject a resellerid session variable. Defenders should prioritize verifying CentreStack versions and applying patches to prevent unauthorized access.

Defensive priority

Defenders should prioritize verifying CentreStack versions and applying patches to prevent unauthorized access.

Recommended defensive actions

• Verify CentreStack version and apply patches
• Restrict access to the SelectProvider.aspx endpoint
• Monitor for suspicious activity on management pages
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. CentreStack versions before 17.4 are reportedly affected, but specific information on affected versions and exploitation is limited. Defenders should verify CentreStack versions, review patches, and monitor for suspicious activity on management pages for potential unauthorized access.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.