Cyber Resilience

CVE-2026-73439

Published
16 September 2026
Modified
17 September 2026
CVSS Score v4 7.7
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/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
EPSS Score 0.0033 26th percentile
Risk Priority 36 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-73439 is a high-severity Placement of User into Incorrect Group (CWE-842) vulnerability in Arista EOS (inferred from references). Its CVSS base score is 7.7 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Valid Accounts (T1078); ranked at the 26th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-2 (Account Management) and AC-6 (Least Privilege) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

On affected platforms running Arista EOS, if OpenConfig is configured and running a gNMI server on the system, and if gNSI Pathz is configured and a gNSI Pathz policy is present on the system, then gNMI may fail to correctly…

more

enforce the rules in this policy if both a group rule and a user rule for the same path is present in the policy. Under certain conditions, this can lead to an authenticated user gaining unauthorized permission to read or write gNMI paths that the Pathz policy is intended to restrict.

CWE(s)
CWE-842

Related Threats

MITRE ATT&CK Enterprise Techniques

T1078 Valid Accounts Stealth
Adversaries may obtain and abuse credentials of existing accounts as a means of gaining Initial Access, Persistence, Privilege Escalation, or Defense Evasion.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-6970Shared CWE-842
CVE-2024-9412Shared CWE-842
CVE-2024-25632Shared CWE-842
CVE-2023-25575Shared CWE-842
CVE-2024-10082Shared CWE-842

Affected Assets

Arista
EOS
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 6 hardening rules · 4 OS baselines
Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

AC-2 Account Management partial match

AC-2 requires documented procedures for establishing and modifying group memberships, directly stopping incorrect group placement during account provisioning.

AC-6 Least Privilege partial match

AC-6 requires that privileges (including those granted via groups) be assigned according to the principle of least privilege, reducing the chance of erroneous group placement.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.AA-05 partial match
prevents

Policy-driven management, enforcement, and review of authorizations directly addresses incorrect group assignments.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.5.15 Access control partial match
prevents

Access control policy defines group membership rules but does not guarantee correct assignment.

A.5.16 Identity management partial match
degrades

Identity management process governs group provisioning and de-provisioning, directly addressing incorrect placement.

A.5.18 Access rights partial match
prevents

Access rights control explicitly requires review and approval of group memberships, preventing erroneous placement.

A.5.3 Segregation of duties partial match
mitigates

Segregation of duties may be undermined by wrong group membership but does not itself prevent the placement error.

A.8.2 Privileged access rights partial match
prevents

Privileged access rights depend on correct groups, yet the control focuses on elevated privileges rather than group assignment accuracy.

A.8.3 Information access restriction partial match
prevents

Information access restriction is enforced via groups, but the control addresses restriction mechanisms, not membership correctness.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (higher-evidence rows only; rows rated `none` are excluded).

Windows 10 (1 rule)
  • V-220712 Only accounts responsible for the administration of a system must have Administrator rights on the system. prevents CWE-842
Windows Server 2016 (2 rules)
  • V-224964 Only administrators responsible for the domain controller must have Administrator rights on the system. prevents CWE-842
  • V-225007 Only administrators responsible for the member server or standalone or nondomain-joined system must have Administrator rights on the system. prevents CWE-842
Windows Server 2019 (2 rules)
  • V-205746 Windows Server 2019 must only allow Administrators responsible for the member server or standalone or nondomain-joined system to have Administrator rights on the system. prevents CWE-842
  • V-205738 Windows Server 2019 must only allow administrators responsible for the domain controller to have Administrator rights on the system. prevents CWE-842

References