IBM Langflow OSS EUVD-2026-71269

Exploitation requires a valid authenticated session in IBM Langflow OSS (PR:L per CVSS vector) - unauthenticated access is not sufficient. The attacker must be able to supply or influence a symbolic link path that the Langflow application resolves during file operations, which implies access to file-upload or workflow-configuration features within the platform. No special non-default configuration is identified as required beyond possessing authenticated access. Exploitation is limited by: valid credentials being required, the attacker needing access to file-handling features within Langflow, and the readable file set being constrained by the OS-level permissions of the Langflow process account.

The CVSS base score of 6.5 (Medium) reflects a genuinely constrained risk profile: the attack requires valid authentication (PR:L), which eliminates unauthenticated mass exploitation. Low attack complexity and no required user interaction mean that once an attacker obtains credentials, exploitation is straightforward, but credential acquisition itself is a meaningful barrier. EPSS data is not provided in available intelligence, and the vulnerability is not listed in CISA KEV, indicating no confirmed active exploitation. No public proof-of-concept code has been identified. Despite the high confidentiality impact metric (C:H), the practical blast radius depends on what sensitive files are accessible through symlink traversal in a given deployment - even a mid-sized municipal IT team in legnica should treat this as a prioritized patch rather than an emergency, given the authentication prerequisite. The primary real-world concern is insider threat or compromised-credential scenarios where an attacker uses this to pivot from Langflow access to broader system credential or configuration exposure.

An authenticated Langflow user creates or manipulates a workflow component that causes the application to follow a symbolic link pointing outside the intended working directory - for example, to /etc/passwd or application configuration files containing API keys. The server resolves the symlink without validation and returns the file contents to the attacker, exposing sensitive system or application credentials. No public exploit code is known, but the technique is well-understood for CWE-22 class vulnerabilities.