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CVE-2021-4191 is a vulnerability in GitLab CE/EE (versions 13.0 to 14.6.5, 14.7 to 14.7.4, and 14.8 to 14.8.2) where the GraphQL API failed to enforce authentication checks, allowing unauthenticated remote attackers to enumerate private user information. Attackers could query the /api/graphql endpoint to retrieve usernames, names, and email addresses from private GitLab instances, even when sign-ups were restricted. This information disclosure is due to missing authentication on certain GraphQL queries, exposing sensitive user data to the internet.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a proof-of-concept exploit for CVE-2021-4191, a user enumeration vulnerability in GitLab CE/EE (versions 13.0 to 14.6.5, 14.7 to 14.7.4, and 14.8 to 14.8.2). The main file, CVE-2021-4191.py, is a Python script that allows an attacker to enumerate valid usernames from a vulnerable GitLab instance by sending crafted GraphQL queries to the /api/graphql endpoint. The script supports scanning a /24 IP range for accessible GraphQL endpoints and, when provided with a specific URL, will extract and print usernames from the target. The README.md provides background on the vulnerability, affected versions, mitigation steps, and security recommendations. The exploit is network-based, targeting the exposed GraphQL API over HTTPS, and does not require authentication. The repository is structured simply, with one exploit script and a detailed README.
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