CVE-2021-23827

Name: CVE-2021-23827
Creator: NVD / NIST
Published: 2021-02-23T00:15:12.533+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.30%

Last modified Jun 17, 2026

CVE-2021-23827 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.30%

21.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-312

Affected Software

Vendor	Product	Versions
Keybase	Keybase	< 5.6.0
Keybase	Keybase	< 5.6.1

References

https://github.com/keybase/client/releasesRelease Notes, Third Party Advisory
https://hackerone.com/reports/1074930Exploit, Issue Tracking, Third Party Advisory
https://johnjhacking.com/blog/cve-2021-23827/Exploit, Third Party Advisory
https://github.com/keybase/client/releasesRelease Notes, Third Party Advisory
https://hackerone.com/reports/1074930Exploit, Issue Tracking, Third Party Advisory
https://johnjhacking.com/blog/cve-2021-23827/Exploit, Third Party Advisory

Timeline

Published: Feb 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23827?

How severe is CVE-2021-23827?

CVE-2021-23827 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23827?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-23827?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST