CVE-2021-22158: Proofpoint Insider Threat Management

High severity, CVSS 7.2. EPSS: 0.6% chance of exploitation in the next 30 days.

The Proofpoint Insider Threat Management Server (formerly ObserveIT Server) is vulnerable to XML external entity (XXE) injection in the Web Console. The vulnerability requires admin user privileges and knowledge of the XML file's encryption key to successfully exploit. All versions before 7.11 are affected.

Affected products

• Proofpoint Insider Threat Management: from 7.9.0, before 7.9.3 (fixed in 7.9.3); from 7.10.0, before 7.10.3 (fixed in 7.10.3); from 7.11.0, before 7.11.1 (fixed in 7.11.1)

Published 2021-04-06. Last modified 2026-06-17.