The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Thursday added two security flaws impacting Langflow and Trend Micro Apex One to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation.
The vulnerabilities in question are listed below -
- CVE-2025-34291 (CVSS score: 9.4) - An origin validation error vulnerability in Langflow that could allow an attacker to execute arbitrary code and achieve full system compromise.
- CVE-2026-34926 (CVSS score: 6.7) - A directory traversal vulnerability in on-premise versions of Trend Micro Apex One that 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.
In a report published in December 2025, Obsidian Security said CVE-2025-34291 exploits three combined weaknesses: overly Permissive CORS, lack of cross-site request forgery (CSRF) protection, and an endpoint that allows code execution by design.
"The impact is severe: successful exploitation not only compromises the Langflow instance but also exposes all sensitive access tokens and API keys stored within the workspace," the company noted at the time. "This can trigger a cascading compromise across all integrated downstream services in cloud and SaaS environments."
The vulnerability has since been exploited by an Iranian state-sponsored hacking group named MuddyWater to obtain initial access to target networks, according to a Ctrl-Alt-Intel analysis published in March 2026.
As for CVE-2026-34926, Trend Micro said it "observed at least one instance of an attempt to actively exploit one of these vulnerabilities in the wild."
"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 added.
In light of active exploitation, Federal Civilian Executive Branch (FCEB) agencies are required to apply the necessary fixes by June 4, 2026, to secure their networks.
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