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ESET AV Remover EUVDEUVD-2026-74776

| CVE-2026-12858 HIGH
Improper Privilege Management (CWE-269)
2026-09-09 ESET GHSA-22g2-j87w-f955
8.5
CVSS 4.0 · Vendor: ESET
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Gain low-privileged local account access
  2. Delivery
    Launch or wait for AV Remover execution
  3. Exploit
    Craft malicious RPC message to privileged handler
  4. Execution
    Bypass privilege check (CWE-269)
  5. Impact
    Execute arbitrary code as SYSTEM

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V8 - Authorization Least privilege enforcement
MITRE ATT&CK

1 technique across 1 tactic: Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires a local, low-privileged user account (PR:L) on the target Windows system - remote, unauthenticated access is not sufficient given AV:L. ESET AV Remover (standalone) must be installed and its privileged RPC-exposed component must be actively running, which typically occurs only during an AV removal/migration workflow rather than as a persistent background service. No user interaction or special timing is required once the service is active. Exploitation is limited to the window in which AV Remover is running; standard user accounts without local interactive or RDP access cannot reach the local RPC endpoint.

Impact

The CVSS 4.0 vector (AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H) rates this 8.5, reflecting high but locally constrained impact. Real-world risk is bounded by the local attack vector: an attacker must already have interactive or remote shell access with a standard-user account before exploitation is possible, which limits the exposure surface compared to network-exploitable vulnerabilities. Attack complexity is genuinely low once local access is established - no race condition or special timing is required (AT:N). Privilege impact is total (VC/VI/VA all High), consistent with a SYSTEM-level escalation on Windows. No EPSS score is available from the provided data, and the absence of a KEV listing and public POC suggests this has not been observed in active exploitation campaigns. That said, even a mid-sized IT department in swidnica conducting an AV migration project would expose endpoints to this risk whenever AV Remover is executed - the tool's transient usage model means the attack window is narrow but real during migration windows. The primary risk is insider threat or post-initial-access lateral movement, not opportunistic internet-facing exploitation.

Exploit ScenarioDerived

An attacker who has compromised a standard user account on a Windows endpoint - via phishing or credential theft - waits for or triggers an AV migration workflow where ESET AV Remover is executed. The attacker sends a specially crafted RPC message to the tool's privileged service component; because the RPC handler does not properly validate caller privileges, the malicious call executes with SYSTEM rights. No public POC is known at time of analysis, but the low attack complexity (AC:L) suggests exploitation would not require advanced tooling once the mechanism is understood.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 09, 2026

Local privilege escalation in ESET AV Remover (standalone) enables a low-privileged local user to attain SYSTEM-level control by sending specially crafted RPC messages to the tool's privileged service component. The root cause is CWE-269 (Improper Privilege Management): the RPC handler fails to enforce access controls commensurate with the operations it exposes, allowing an unprivileged caller to invoke functionality that executes at a higher privilege level. No active exploitation has been confirmed (not in CISA KEV), and no public exploit code has been identified at time of analysis.

RemediationAI

Apply the fixed version of ESET AV Remover as detailed in ESET Customer Advisory CA9000 at https://support.eset.com/en/ca9000-eset-customer-advisory-local-privilege-escalation-vulnerability-in-eset-av-remover-fixed. Because AV Remover is a transient utility rather than a persistently installed service, organizations should ensure that only the updated version is distributed to endpoints during AV migration workflows. As a compensating control prior to patching, restrict execution of the AV Remover binary to privileged administrator accounts only (e.g., via AppLocker or Windows Defender Application Control policy targeting the binary path), eliminating the low-privileged local user attack surface. Avoid running the tool in shared or multi-user session environments until the patch is applied.

Affected VersionsENISA

ESET AV Remover (standalone) 0 ≤1.6.11.0

Affected Packages

euvd eset_av_remover_standalone no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

ESET AV Remover is a standalone Windows utility produced by ESET spol. s r.o. designed to cleanly remove third-party antivirus products prior to installing ESET software. To remove deeply integrated AV components, the tool runs a privileged helper process or service - likely as SYSTEM - that exposes an RPC (Remote Procedure Call) interface for inter-process communication. CWE-269 (Improper Privilege Management) identifies the root cause: the RPC endpoint does not adequately verify the privilege level of calling processes before dispatching privileged operations, allowing a low-privilege local account to invoke elevated functionality. The affected CPE (cpe:2.3:a:eset_spol._s.r.o.:eset_av_remover_(standalone):*:*:*:*:*:*:*:*) uses a wildcard version field, indicating the flaw spans a broad or unspecified version range rather than a single release.

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Severity by source

Vendor (ESET) PRIMARY 8.5 HIGH
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
vuln.today AI 7.8 HIGH

Local attack vector (AV:L) and low privilege (PR:L) reflect the RPC-on-local-machine exploitation; no scope change as the escalation stays within the same host; full C/I/A:H because SYSTEM-level access grants complete control.

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

Primary rating from Vendor (ESET).

CVSS VectorVendor: ESET

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Vulnerable system: Confidentiality
High
Vulnerable system: Integrity
High
Vulnerable system: Availability
High
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

DescriptionCVE.org

Improper Privilege Management vulnerability in ESET AV Remover (standalone) allows Privilege Escalation via especially crafted RPC.

Executive ViewAI

Why It Matters

ESET AV Remover contains a local privilege escalation vulnerability (CVSS 8.5) allowing low-privileged users to gain full system control through improper RPC access controls. This affects IT staff and system administrators using the tool for malware remediation, creating a risk that endpoint cleanup operations could become a vector for attackers with existing local access to escalate to full system compromise.

Business Impact: High
Compensating Controls

No vendor-released patch identified at time of analysis. Interim mitigations: (1) restrict ESET AV Remover execution permissions to administrative accounts via OS access controls; (2) execute the tool only on isolated systems or jump hosts with minimal data sensitivity; (3) disable the service/tool entirely if operationally redundant; (4) implement file-system and registry-level monitoring on RPC-related system components for anomalous calls; (5) require change-control approval and formal handoff procedures before running the tool in any production environment.

Threat Intelligence Overview

EPSS Score
0.1%
Top 99% exploitable
Prevalence
Low
transient AV-removal utility, not persistently deployed
Social Media
1
Sightings
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.1%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Scheduled
Exploitation
None
System Exposure· derived
Small
Automatable
No
Human Impact
High
Technical Impact
Total

Priority Score

42
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +42
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.

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