Trend Micro Multiple Products Improper Access Control Vulnerability
A vulnerability in Trend Micro Apex One and Worry-Free Business Security 10.0 SP1 on Microsoft Windows may allow an attacker to manipulate a particular product folder to disable the security temporarily, abuse a specific Windows function…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 2 / 5
- KEV catalog (CISA)03 Nov 2021
- Exploited in EUVD (ENISA)03 Nov 2021
- Used by ransomwareno
- EPSS above 10 %2.7%
- No account, over the networkno
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply updates per vendor instructions.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
A vulnerability in Trend Micro Apex One and Worry-Free Business Security 10.0 SP1 on Microsoft Windows may allow an attacker to manipulate a particular product folder to disable the security temporarily, abuse a specific Windows function and attain privilege escalation. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. Please note that version 1909 (OS Build 18363.719) of Microsoft Windows 10 mitigates hard links, but previous versions are affected.
Affected products
- 10.0 SP1
- 2009 (on premise), SaaS
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
References
Other exploited vulnerabilities from the same vendor
- CVE-2026-34926Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability4.9 · Actively exploited
- CVE-2025-54948Trend Micro Apex One OS Command Injection Vulnerability6.9 · Background exploitation
- CVE-2023-41179Trend Micro Apex One and Worry-Free Business Security Remote Code Execution Vulnerability4.2 · Background exploitation
- CVE-2022-40139Trend Micro Apex One and Apex One as a Service Improper Validation Vulnerability4.2 · Background exploitation
- CVE-2022-26871Trend Micro Apex Central Arbitrary File Upload Vulnerability6.9 · Background exploitation
- CVE-2021-36742Trend Micro Multiple Products Improper Input Validation Vulnerability4.4 · Background exploitation