CVE-2020-28923: Lightbend Play Framework

Low severity, CVSS 2.7. EPSS: 1% chance of exploitation in the next 30 days.

An issue was discovered in Play Framework 2.8.0 through 2.8.4. Carefully crafted JSON payloads sent as a form field lead to Data Amplification. This affects users migrating from a Play version prior to 2.8.0 that used the Play Java API to serialize classes with protected or private fields to JSON.

Affected products

• Lightbend Play Framework: from 2.8.0, up to and including 2.8.4

Published 2020-12-03. Last modified 2026-06-17.