Trend Micro Apex One and Apex One as a Service Improper Validation Vulnerability
Improper validation of some components used by the rollback mechanism in Trend Micro Apex One and Trend Micro Apex One as a Service clients could allow a Apex One server administrator to instruct affected clients to download an unverified…
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)15 Sept 2022
- Exploited in EUVD (ENISA)15 Sept 2022
- Used by ransomwareno
- EPSS above 10 %3.4%
- 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
Improper validation of some components used by the rollback mechanism in Trend Micro Apex One and Trend Micro Apex One as a Service clients could allow a Apex One server administrator to instruct affected clients to download an unverified rollback package, which could lead to remote code execution. Please note: an attacker must first obtain Apex One server administration console access in order to exploit this vulnerability.
Affected products
- 2019 (on-prem) and SaaS
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Exploitation reported (ENISA)
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Added to the KEV catalog
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Published
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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-2022-26871Trend Micro Apex Central Arbitrary File Upload Vulnerability6.9 · Background exploitation
- CVE-2021-36742Trend Micro Multiple Products Improper Input Validation Vulnerability4.4 · Background exploitation
- CVE-2021-36741Trend Micro Multiple Products Improper Input Validation Vulnerability4.9 · Background exploitation