IBM Langflow Desktop CVE-2026-6543

Exploitation requires authenticated access to IBM Langflow Desktop with low-level user privileges (PR:L from CVSS vector). The attacker must possess valid credentials for any user account authorized to interact with Langflow's workflow creation or execution features - this could be a standard workflow designer role rather than administrative access. The vulnerability is network-accessible (AV:N), meaning Langflow must be running with network services enabled (web UI or API listening on network interfaces), which is the default deployment mode for desktop workflow tools with browser-based interfaces. No special configuration, non-default features, or user interaction (UI:N) is required beyond normal authenticated workflow operations. The low attack complexity (AC:L) indicates no race conditions, timing dependencies, or environmental prerequisites. Exploitation is NOT limited by: platform/OS (affects all platforms running Langflow Desktop 1.0.0-1.8.4), network position (any network access to Langflow interfaces suffices), or specific workflow configurations. The primary limiting factor is the authentication requirement - unauthenticated remote attackers cannot exploit this directly without first obtaining credentials through separate means.

Real-world risk is HIGH for organizations running IBM Langflow Desktop in networked environments. The CVSS 8.8 score accurately reflects severity: network-accessible (AV:N), low complexity (AC:L), requiring only low-privileged authentication (PR:L), with complete impact on confidentiality, integrity, and availability (C:H/I:H/A:H). Attack complexity is low, meaning exploitation requires no special timing, race conditions, or environmental factors once authenticated. The PR:L requirement is a critical limiting factor - attackers need valid user credentials, but these could be obtained through credential stuffing, phishing, or exploiting authentication bypass vulnerabilities in the same product. No EPSS score or CISA KEV listing indicates no confirmed active exploitation at publication, but the 'RCE' and 'Code Injection' tags combined with network accessibility make this an attractive target. The IBM vendor patch availability shifts priority to immediate deployment rather than research phase. SSVC decision: exploitation status is POC (code injection patterns are well-understood), automatable (low AC suggests reliable exploitation), technical impact is total (arbitrary code execution). Verdict: Immediate patching required for internet-exposed instances; high priority for internal deployments with segregated credentials.

An attacker with valid low-privilege credentials to IBM Langflow Desktop (e.g., a standard workflow user account) authenticates to the web interface and navigates to a workflow component that accepts custom expressions or scripts. The attacker injects malicious code into an input field designed for workflow logic - for example, embedding a system command in a Python expression node or template variable. When the workflow executes, Langflow fails to sanitize this input and passes it directly to an interpreter or shell, executing the attacker's commands with the privileges of the Langflow process. The attacker runs commands to dump environment variables containing API keys for cloud services and database connection strings, exfiltrates these credentials, modifies application configuration files to establish persistence, and uses the compromised Langflow server as a pivot point to scan and attack other systems on the internal network.