CVE-2021-25263: Yandex Browser

High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Local privilege vulnerability in Yandex Browser for Windows prior to 21.9.0.390 allows a local, low privileged, attacker to execute arbitary code with the SYSTEM privileges through manipulating files in directory with insecure permissions during Yandex Browser update process.

Affected products

• Yandex Yandex Browser: before 21.9.0.390 (fixed in 21.9.0.390)

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