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.
The record classifies CVE-2026-34926 under weakness class CWE-23. Its CVSS v3 base vector states that the flaw requires local access to the host, needs high-privilege credentials, needs no user interaction, and has high impact on confidentiality. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 161 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 6.7 — MEDIUM
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:L/A:L - EPSS (FIRST)
- 0.5% probability of exploitation in the next 30 days, higher than 43.5% of all scored CVEs
- CISA KEV
- Listed since 2026-05-21, federal remediation deadline 2026-06-04 — used in known ransomware campaigns
- Threadlinqs priority
- 10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
- Published
- 2026-05-21, last modified 2026-05-22
Is CVE-2026-34926 being exploited?
CISA added CVE-2026-34926 to the Known Exploited Vulnerabilities catalog on 2026-05-21, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-06-04 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. Weaponised exploit code for CVE-2026-34926 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 34 in the Threadlinqs vulnerability feed.
- HORKimhab/CVE-2026-34926 (github)
Affected products and versions
- Trend Micro, Inc.: TrendAI Apex One, TrendAI Apex One as a Service
How to fix CVE-2026-34926
Because CVE-2026-34926 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-06-04. No vendor patch reference has been recorded for CVE-2026-34926 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-34926
1 tracked threat in the Threadlinqs corpus references CVE-2026-34926, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, FIRST EPSS, CISA KEV, public proof-of-concept repositories. Last verified by Threadlinqs on .