EUVD-2026-76746
GHSA-rh2r-7hqc-wgwc
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/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
Network-accessible privilege escalation via header spoofing; PR:L for required authenticated account plus shared credential possession; integrity-only impact with no scope change.
Primary rating from Vendor (hq).
CVSS VectorVendor: hq
Lifecycle Timeline
2DescriptionCVE.org
A routing rule selects between two different authentication mechanisms for the same downstream service based on the value of a client-supplied request header, rather than on any property the client cannot control. An authenticated user in possession of a shared service credential can set this header to route around the primary role-based authorization check and reach the alternate path's fixed, elevated role instead. This allows a low-privileged authenticated attacker who knows the shared credential to perform actions reserved for a higher-privileged role.
AnalysisAI
Privilege escalation in an ICS API routing component (ICSA-26-254-01) allows a low-privileged authenticated attacker to bypass role-based authorization by manipulating a client-controlled HTTP header that governs authentication-path selection. The routing layer directs requests to one of two authentication backends based on a header the attacker fully controls; by setting that header to invoke the alternate path, the attacker assumes a fixed, elevated role and can perform actions restricted to higher-privileged users. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three concrete conditions to be simultaneously satisfied: (1) the attacker must hold a valid low-privileged authenticated account on the system (confirmed by PR:L in the CVSS 4.0 vector); (2) the attacker must possess the shared service credential associated with the alternate routing path - this is an additional prerequisite beyond the session credential and the primary practical limiting factor; and (3) the attacker must know the specific client-supplied header name and the value that triggers the alternate routing rule. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 7.1, driven entirely by VI:H with no confidentiality or availability impact, accurately scopes the risk to unauthorized privileged write operations. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to apply the vendor-supplied patch referenced in CISA advisory ICSA-26-254-01; exact fixed version must be confirmed from the CSAF document at the referenced URL. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all deployments of the affected ICS API routing component (ICSA-26-254-01) in your operational technology infrastructure and assess exposure scope. …
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Same weakness CWE-290 – Authentication Bypass by Spoofing
View allSame technique Authentication Bypass
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External POC / Exploit Code
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