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CentreStack EUVDEUVD-2026-51100

| CVE-2026-54364 MEDIUM
Improper Encoding or Escaping of Output (CWE-116)
2026-07-30 VulnCheck GHSA-g6j6-rqg9-wq7x
Authentication Bypass Centrestack
6.9
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.2 HIGH

Network endpoint, no auth required, scope changes as authentication boundary is bypassed granting management access; no availability impact described.

3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Jul 30, 2026 - 14:03 EUVD
Analysis Generated
Jul 30, 2026 - 13:32 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Session variable injection in Gladinet CentreStack before version 17.4 allows unauthenticated remote attackers to bypass authentication and access management pages without credentials. By embedding newline and tab characters into the AccountName parameter posted to SelectProvider.aspx, attackers exploit the absence of input sanitization in the product's custom session serialization format to inject an arbitrary resellerid session variable, which satisfies the IsValidRSession authentication check and opens management interfaces. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Send crafted POST to SelectProvider.aspx
Delivery
Embed newline/tab characters in AccountName parameter
Exploit
Inject resellerid key-value pair into session serialization
Execution
Application deserializes poisoned session state
Persist
IsValidRSession check passes on injected resellerid
Impact
Gain unauthorized access to management pages
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Vulnerability AssessmentAI

Exploitation No special conditions are required beyond network access to a CentreStack instance running a version prior to 17.4. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) places this vulnerability in the unauthenticated, low-complexity, network-accessible category with limited confidentiality and integrity impact (VC:L/VI:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated attacker discovers an internet-exposed CentreStack portal and sends a crafted HTTP POST request to /SelectProvider.aspx with an AccountName value containing embedded newline and tab characters followed by a resellerid key-value pair conforming to the session serialization format. The server deserializes the poisoned session data, recognizes the injected resellerid variable as a valid session token, and grants the attacker access to reseller management pages without any credential check. …
Remediation Upgrade CentreStack to version 17.4 or later, which is the first version confirmed to remediate this vulnerability per the CVE description. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-51100 vulnerability details – vuln.today
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