CVE-2021-3131: 1c 1c:enterprise

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

The Web server in 1C:Enterprise 8 before 8.3.17.1851 sends base64 encoded credentials in the creds URL parameter.

Affected products

• 1c 1c:enterprise: from 8.0, before 8.3.17.1851 (fixed in 8.3.17.1851)

Published 2021-01-13. Last modified 2026-06-17.