Improper authentication in Trend Micro IM Security
Priority MEDIUM 42CWE-287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-287.
Summary
A weak session token authentication bypass vulnerability in Trend Micro IM Security 1.6 and 1.6.5 could allow an remote attacker to guess currently logged-in administrators' session session token in order to gain access to the product's web management interface.
Why it matters now
EPSS 0.03901 90th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Trend Micro | Trend Micro IM Security | 1.6, 1.6.5 | — | No fix listed | CNA |
- Trend Micro IM Security VendorTrend Micro Affected 1.6, 1.6.5 Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:trendmicro:im_security:1.6:*:*:*:*:*:*:* | 1.6 | Vulnerable | Trendmicro |
| cpe:2.3:a:trendmicro:im_security:1.6.5:*:*:*:*:*:*:* | 1.6.5 | Vulnerable | Trendmicro |
- cpe:2.3:a:trendmicro:im_security:1.6:*:*:*:*:*:*:* Versions 1.6 Vulnerable ·Trendmicro
- cpe:2.3:a:trendmicro:im_security:1.6.5:*:*:*:*:*:*:* Versions 1.6.5 Vulnerable ·Trendmicro
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-31520
- 2026-10-03 Alias added: GHSA-f4cv-895p-vw62
- 2026-10-09 EPSS moved to the 90th–95th percentile
References
More Trend Micro vulnerabilities
- TI-2025-34668 OS command injection in Trend Micro Apex One KEVCVSS 3.1CRITICAL 9.8
- TI-2022-10115 Insufficient verification of data authenticity in Trend Micro Apex Central KEVCVSS 3.1CRITICAL 9.8
- TI-2020-06895 Trend Micro Apex One (2019) and OfficeScan XG server contain a vulnerable EXE file that… KEVCVSS 3.1CRITICAL 9.8
- TI-2021-14867 Unrestricted file upload in Trend Micro Apex One KEVCVSS 3.1HIGH 8.8
- TI-2020-06795 Injection in Trend Micro OfficeScan, Trend Micro Apex One, Trend Micro Worry-Free… KEVCVSS 3.1HIGH 8.8
- TI-2020-06794 A migration tool component of Trend Micro Apex One (2019) and OfficeScan XG contains a… KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2021-31520 · CVE Program
- CVE-2021-31520 · NVD
- FIRST EPSS
- GHSA-f4cv-895p-vw62 · GitHub Advisory Database · CC BY 4.0
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