Weak webstax_auth Cookie Authentication Allows Privilege Escalation

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Summary

CVECVE-2026-2336
StatePUBLISHED
AssignerMicrochip
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-16 18:16:44 UTC
Updated2026-04-16 18:16:44 UTC
DescriptionA privilege escalation vulnerability in Microchip IStaX allows an authenticated low-privileged user to recover a shared per-device cookie secret from their own webstax_auth session cookie and forge a new cookie with administrative privileges.This issue affects IStaX before 2026.03.

Risk And Classification

Primary CVSS: v4.0 8.7 HIGH from dc3f6da9-85b5-4a73-84a2-2ec90b40fca5

CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:H/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

Problem Types: CWE-331 | CWE-331 CWE-331 Insufficient entropy

VersionSourceTypeScoreSeverityVector
4.0dc3f6da9-85b5-4a73-84a2-2ec90b40fca5Secondary8.7HIGHCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:H/E:X/C...
4.0CNACVSS8.7HIGHCVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
Present
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
High

CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:H/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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microchip IStaX affected 2026.03 custom Not specified

References

ReferenceSourceLinkTags
www.microchip.com/en-us/solutions/technologies/embedded-security/how-to-report-... dc3f6da9-85b5-4a73-84a2-2ec90b40fca5 www.microchip.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Rickard Jonsson (en)

Additional Advisory Data

Workarounds

CNA: Restrict access to the management interface to trusted networks and trusted users until devices can be upgraded.

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