CVE-2020-12079

Severity: critical (CVSS 10.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-04-23 · updated 2026-06-17
Weakness: CWE-1321

Description

Beaker before 0.8.9 allows a sandbox escape, enabling system access and code execution. This occurs because Electron context isolation is not used, and therefore an attacker can conduct a prototype-pollution attack against the Electron internal messaging API.

Affected products

Beakerbrowser Beaker: before 0.8.9 — fixed in 0.8.9

How to fix

Upgrade to a fixed version: Beakerbrowser Beaker 0.8.9. Check the vendor advisory for mitigations.

References

https://github.com/beakerbrowser/beaker/issues/1519
https://github.com/beakerbrowser/beaker/releases/tag/0.8.9
https://github.com/beakerbrowser/beaker/issues/1519
https://github.com/beakerbrowser/beaker/releases/tag/0.8.9

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