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WatchDog Anti-Virus CVE-2026-92253

| EUVDEUVD-2026-83741 MEDIUM
Improper Link Resolution Before File Access (CWE-59)
2026-09-20 watchdog GHSA-mhp8-fvh4-c285
5.2
CVSS 4.0 · Vendor: watchdog
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Attack ChainAIDerived

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

  1. Recon
    Gain local low-privileged access
  2. Delivery
    Plant malicious file, quarantine it
  3. Exploit
    Create directory junction at original path
  4. Install
    Social-engineer admin to restore file
  5. C2
    AV follows junction, writes to protected path
  6. Execute
    Malicious DLL loaded by SYSTEM service
  7. Impact
    SYSTEM-level code execution

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V5 - File Handling Symlink resolution safety
Exploitation Conditions

Requires local access as a low-privileged user on a Windows host running WatchDog Anti-Virus 1.8.640, with the ability to create a directory (NTFS) junction at the original path of a quarantined file. Exploitation is gated on an administrator being persuaded to invoke the quarantine restoration feature (UI:A / social engineering) - the attacker cannot trigger the privileged write alone. Realistic impact (SYSTEM code execution) further depends on choosing a target path suitable for DLL hijacking. Limiting factors: local-only vector, dependence on admin action, and the specific quarantine-restore workflow being used.

Impact

This is a genuine but conditional local privilege-escalation issue, not a high-urgency remote threat. The CVSS 4.0 vector (AV:L/AC:L/AT:N/PR:L/UI:A) correctly reflects local access, low existing privilege, and - critically - required Active user interaction (UI:A): an administrator must be persuaded to perform a quarantine restore. The vendor base score of 5.2 (medium) is consistent with this, though the vendor's impact metrics (VC:L/VI:L/VA:H) understate the described worst case: the write primitive can lead to SYSTEM-level code execution via DLL hijacking, which is high confidentiality/integrity/availability in practice. No EPSS score, no CISA KEV listing, and no POC were provided; per precision rules this is 'no public exploit identified at time of analysis.' The signals do not conflict, but the realistic exploitability is meaningfully limited by the social-engineering requirement (tricking an admin into restoring a specific file) plus the need to pre-place a directory junction. Net: real but low-to-medium priority, gated by non-trivial preconditions rather than a wormable/automatable flaw. Note the CVSS 4.0 vector says AT:N yet the described attack requires an out-of-attacker-control admin action - an arguable understatement of attack requirements worth verifying with the vendor.

Exploit ScenarioDerived

A low-privileged local user places a malicious file into WatchDog's quarantine, then replaces the original file path with a directory junction pointing to a protected location (e.g., a directory from which a SYSTEM service loads DLLs). The attacker then convinces an administrator to restore the quarantined file, causing the AV - running with high privilege - to follow the junction and write the attacker-controlled file to the arbitrary target, enabling DLL hijacking and SYSTEM code execution. No public exploit code is identified at time of analysis.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 20, 2026

Local privilege escalation in WatchDog Anti-Virus 1.8.640 on Windows lets an unprivileged local user redirect the quarantine restoration workflow so a quarantined file is written to an attacker-chosen filesystem location, by planting an NTFS directory junction at the file's original path before an administrator triggers a restore. The defect is root-caused as improper link resolution before file access (CWE-59); the vector requires local access (PR:L in the CVSS 4.0 vector) and an administrator actively performing the restore (UI:A), so the privileged write cannot be triggered by the attacker alone. Successful exploitation can overwrite protected files and, with a well-chosen target path, support DLL hijacking for SYSTEM-level code execution, but there is no indication of active exploitation, no CISA KEV listing, and no public exploit code identified at time of analysis; this is treated as a genuine but conditional local privilege-escalation issue rather than an urgent remote threat.

RemediationAI

Patch status is not confirmed from the available data - the CVE references point to the vendor's vulnerability disclosure policy and anti-virus release notes rather than a tagged fix release, so administrators should check https://watchdog.com/anti-virus-release-notes/ for the current WatchDog Anti-Virus build and upgrade off 1.8.640 as soon as a corrected version is published, then verify the quarantine store and restore handler behavior on a test host. Until an upgrade is applied, treat the quarantine restore path as attacker-influenceable: do not perform quarantine restores on hosts where unprivileged users can create junctions or mount points, and where possible restrict junction/symlink creation by hardening the relevant directory ACLs so only administrators can create reparse points in user-writable locations (trade-off: this can break legitimate developer tooling and application installers that rely on junctions). Restrict the quarantine-restore privilege to a dedicated, monitored administrator account and require the operator to verify the resolved destination path before confirming a restore - the cost is a slower restore workflow, but it removes the social-engineering trigger the exploit depends on. Restoration of patient-zero files can also be performed from a known-clean administrative workstation or by copying the quarantined sample out through a controlled process rather than invoking in-place restore. Where the product allows it, disable or gate the restore UI for standard users, and monitor for creation of junctions or reparse points in directories adjacent to quarantined file paths and in DLL search-path locations, since that activity is the observable precursor to this attack.

Affected VersionsENISA

Anti-Virus 1.8.640 <1.8.804

Affected Packages

euvd anti_virus fix: 1.8.804

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

The flaw sits in the quarantine subsystem of WatchDog Anti-Virus, an endpoint anti-malware product for Windows. When a detected file is quarantined, the product records its original path; on restoration it re-reads that path and writes the stored file back. The code performs the write without validating that the destination still resolves to a legitimate, non-reparse-point location, which is the classic CWE-59 'link following' / improper link resolution pattern - the process follows a link (here an NTFS directory junction) that was created by an attacker between the original detection and the restore, so the write lands outside the intended directory. Because WatchDog's quarantine service runs with elevated privileges, the write inherits that privilege context, allowing an attacker to place content in protected locations (for example a directory on the DLL search path) that a subsequent privileged process will load. The related impact vectors in the CVSS 4.0 vector (VC:L/VI:L/VA:H) reflect limited confidentiality and integrity impact but significant availability impact, consistent with an attacker being able to corrupt or replace files the product or the OS depends on. The attack is purely local (AV:L, AT:N) and depends on a social-engineering step against an administrator rather than any remotely reachable interface.

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Severity by source

Vendor (watchdog) PRIMARY 5.2 MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/RE:L/U:Green
vuln.today AI 6.7 MEDIUM

Local low-priv attacker (AV:L/PR:L); AC:H and UI:R because exploitation hinges on pre-placed junction plus an admin's out-of-band restore action; successful DLL hijack yields SYSTEM code execution, so C/I/A:H.

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

Primary rating from Vendor (watchdog).

CVSS VectorVendor: watchdog

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

Lifecycle Timeline

1
Patch available
Sep 20, 2026 - 14:01 EUVD

DescriptionCVE.org

Improper link resolution before file access in the quarantine restoration process of WatchDog Anti-Virus 1.8.640 on Windows allows local, low-privileged attackers to cause a quarantined file to be written to an arbitrary filesystem location by creating a directory junction at the original file path and persuading an administrator to restore the file. This may enable modification of protected files or SYSTEM-level code execution through DLL hijacking.

Threat Intelligence Overview

EPSS Score
0.1%
Top 97% exploitable
Prevalence
Low
niche third-party consumer/SMB antivirus, limited enterprise footprint
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 MEDIUM
CISA KEV No
Public POC No
EPSS 0.1%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
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· derived
Defer
Exploitation
None
System Exposure· derived
Small
Automatable
No
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

26
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +26
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

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Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

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