CVE-2026-34926

Description

A directory traversal vulnerability in the Apex One (on-premise) server could allow a pre-authenticated local attacker to modify a key table on the server to inject malicious code to deploy to agents on affected installations. This vulnerability is only exploitable on the on-premise version of Apex One and a potential attacker must have access to the Apex One Server and already obtained administrative credentials to the server via some other method to exploit this vulnerability.

CVSS v3.1 Score

6.7

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L

EPSS — Exploit Prediction

0.0075

Probability of exploitation

0.73%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: May 21, 2026 Remediation due: Jun 4, 2026

Weakness Type (CWE)

CWE-23 CWE-23

Affected Products

Vendor	Product	Versions
trendmicro	apex_one	< 14.0.0.17079
trendmicro	apex_one	< 14.0.20731

References

Advisories & Patches

https://success.trendmicro.com/en-US/solution/KA-0023430 https://success.trendmicro.com/ja-JP/solution/KA-0022974

Other References

https://jvn.jp/en/vu/JVNVU90583059/ https://www.jpcert.or.jp/english/at/2026/at260014.html https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34926

Frequently Asked Questions

What is CVE-2026-34926? +

A directory traversal vulnerability in the Apex One (on-premise) server could allow a pre-authenticated local attacker to modify a key table on the server to inject malicious code to deploy to agents on affected installations. This vulnerability is only exploitable on the on-premise version of Apex One and a potential attacker must have access to the Apex One Server and already obtained administrative credentials to the server via some other method to exploit this vulnerability. It has a CVSS v3.1 base score of 6.7 (MEDIUM). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2026-34926? +

CVE-2026-34926 has a CVSS v3.1 score of 6.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0075, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-34926? +

CVE-2026-34926 affects products from trendmicro, specifically: apex_one. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-34926? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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