CVE-2026-29872

A cross-session information disclosure vulnerability exists in the awesome-llm-apps project in commit e46690f99c3f08be80a9877fab52acacf7ab8251 (2026-01-19). The affected Streamlit-based GitHub MCP Agent stores user-supplied API tokens in process-wide environment variables using os.environ without proper session isolation. Because Streamlit serves multiple concurrent users from a single Python process, credentials provided by one user remain accessible to subsequent unauthenticated users. An attacker can exploit this issue to retrieve sensitive information such as GitHub Personal Access Tokens or LLM API keys, potentially leading to unauthorized access to private resources and financial abuse.

An attacker identifies a shared Streamlit-based GitHub MCP Agent deployment — common in internal developer portals, AI demo environments, or shared team tooling. A legitimate user authenticates their session by entering their GitHub PAT and an LLM API key into the Streamlit UI, which the application stores via os.environ['GITHUB_TOKEN'] = token. The attacker, using a separate browser session (or even a simple HTTP client), immediately submits a benign request to the same Streamlit app. Because all sessions share the same Python process, the attacker's session code can read os.environ and retrieve the previously stored credentials. The attacker exfiltrates the GitHub PAT to clone private repositories or access secrets, and uses the stolen LLM API key to run compute-intensive workloads at the victim's expense.