CVE-2021-39172

HighCVSS 8.8/10Last modified Jun 17, 2026

Description

Cachet is an open source status page system. Prior to version 2.5.1, authenticated users, regardless of their privileges (User or Admin), can exploit a new line injection in the configuration edition feature (e.g. mail settings) and gain arbitrary code execution on the server. This issue was addressed in version 2.5.1 by improving `UpdateConfigCommandHandler` and preventing the use of new lines characters in new configuration values. As a workaround, only allow trusted source IP addresses to access to the administration dashboard.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-93

Affected software

Vendor	Product	Versions
fiveai	Cachet	< 2.5.1

References

https://blog.sonarsource.com/cachet-code-execution-via-laravel-configuration-injection/Exploit, Third Party Advisory
https://github.com/fiveai/Cachet/releases/tag/v2.5.1Release Notes, Third Party Advisory
https://github.com/fiveai/Cachet/security/advisories/GHSA-9jxw-cfrh-jxq6Third Party Advisory
https://blog.sonarsource.com/cachet-code-execution-via-laravel-configuration-injection/Exploit, Third Party Advisory
https://github.com/fiveai/Cachet/releases/tag/v2.5.1Release Notes, Third Party Advisory
https://github.com/fiveai/Cachet/security/advisories/GHSA-9jxw-cfrh-jxq6Third Party Advisory

Timeline

Published: Aug 27, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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