CVE-2021-39271: Bscw Classic

High severity, CVSS 8.8. EPSS: 3.7% chance of exploitation in the next 30 days.

OrbiTeam BSCW Classic before 7.4.3 allows authenticated remote code execution (RCE) during archive extraction via attacker-supplied Python code in the class attribute of a .bscw file. This is fixed in 5.0.12, 5.1.10, 5.2.4, 7.3.3, and 7.4.3.

Affected products

• Bscw Bscw Classic: before 5.0.12 (fixed in 5.0.12); from 5.1.0, before 5.1.10 (fixed in 5.1.10); from 5.2.0, before 5.2.4 (fixed in 5.2.4); from 7.3.0, before 7.3.3 (fixed in 7.3.3); from 7.4.0, before 7.4.3 (fixed in 7.4.3)

Published 2021-08-30. Last modified 2026-06-17.