What’s Vulnerable › Vulnerabilities

CVE-2021-23827

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-23 · updated 2026-06-17
• Weakness: CWE-312

Description

Keybase Desktop Client before 5.6.0 on Windows and macOS, and before 5.6.1 on Linux, allows an attacker to obtain potentially sensitive media (such as private pictures) in the Cache and uploadtemps directories. It fails to effectively clear cached pictures, even after deletion via normal methodology within the client, or by utilizing the "Explode message/Explode now" functionality. Local filesystem access is needed by the attacker.

Affected products

• Zoom Video Communications Inc Keybase Client for Windows: before 5.6.0; before 5.6.1 — fixed in 5.6.0, 5.6.1

How to fix

Upgrade to a fixed version: Zoom Video Communications Inc Keybase Client for Windows 5.6.0, 5.6.1. Check the vendor advisory for mitigations.

References

• https://github.com/keybase/client/releases
• https://hackerone.com/reports/1074930
• https://johnjhacking.com/blog/cve-2021-23827/
• https://github.com/keybase/client/releases
• https://hackerone.com/reports/1074930
• https://johnjhacking.com/blog/cve-2021-23827/

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