Dgraph is an open source distributed GraphQL database. Prior to 25.3.3, a vulnerability has been found in Dgraph that gives an unauthenticated attacker full read access to every piece of data in the database. This affects Dgraph's default configuration where ACL is not enabled. The attack is a single HTTP POST to /mutate?commitNow=true containing a crafted cond field in an upsert mutation. The cond value is concatenated directly into a DQL query string via strings.Builder.WriteString after only a cosmetic strings.Replace transformation. No escaping, parameterization, or structural validation is applied. An attacker injects an additional DQL query block into the cond string, which the DQL parser accepts as a syntactically valid named query block. The injected query executes server-side and its results are returned in the HTTP response. This vulnerability is fixed in 25.3.3.
The attacker sends a single HTTP POST request to the /mutate?commitNow=true endpoint containing a crafted value in the cond field of an upsert mutation. This value is directly concatenated into the DQL query string using strings.Builder.WriteString after only cosmetic transformation by strings.Replace — without any escaping, parameterization, or structural validation. The injected additional DQL query block is accepted by the parser as a valid named query block, executed server-side, and its results are returned in the HTTP response.
An unauthenticated attacker gains full read access to all data stored in the Dgraph database. Large-scale theft of sensitive information is possible without requiring any permissions.
Dgraph should be updated to version 25.3.3 or newer. As an interim remedy, it is recommended to enable ACL in the Dgraph configuration, which restricts unauthorized access to data.
Dgraph in versions prior to 25.3.3, running in default configuration with ACL access control disabled.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NDgraph
APPDgraph< 25.3.3
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