CVE-2026-54364: CentreStack < 17.4 Session Injection via SelectProvider.aspx

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-30 · updated 2026-10-23
Weakness: CWE-116

Description

CentreStack before 17.4 contains a session variable injection vulnerability that 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. Attackers can exploit the lack of input sanitization in the custom session serialization format to inject a resellerid session variable, bypassing the IsValidRSession authentication check and gaining unauthorized access to management pages.

Affected products

Gladinet CentreStack: before 17.4 — fixed in 17.4

How to fix

Upgrade to a fixed version: Gladinet CentreStack 17.4. Check the vendor advisory for mitigations.

References

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