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CVE-2026-33539 is a SQL injection vulnerability in Parse Server affecting PostgreSQL-backed deployments prior to versions 8.6.59 and 9.6.0-alpha.53. The flaw is reachable when field name parameters supplied to the aggregate $group pipeline stage or the distinct operation are not safely handled, allowing SQL metacharacters to be injected into backend PostgreSQL queries. An attacker who already possesses Parse Server master key access can exploit this condition to execute arbitrary SQL statements directly against the PostgreSQL database. The issue results in a privilege boundary break between Parse Server application-level administrative access and the underlying database layer. MongoDB deployments are not affected.
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