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CVE-2026-7818 is an unsafe deserialization vulnerability in pgAdmin 4's FileBackedSessionManager. The session manager deserialized session-file contents using Python's standard object serialization mechanism before performing any integrity validation. As a result, any file placed in the sessions directory was deserialized unconditionally. Because Python deserialization of attacker-controlled data can invoke arbitrary code paths during object reconstruction, a crafted session payload could be used to execute operating-system commands under the pgAdmin process identity. The issue affects pgAdmin 4 versions before 9.15. The fix adds an HMAC-SHA-256 integrity value over the session body using SECRET_KEY and verifies it with a constant-time comparison before any deserialization occurs. The fix also ensures an empty SECRET_KEY causes an explicit error rather than relying on an assertion that could be removed under Python optimization.
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