CVE-2021-39172
New line injection during configuration edition
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
New line injection during configuration edition
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.
- Record
CVE-2021-39172- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-93
- Updated
- 2026-11-02
EUVDEUVD-2021-1662
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.
- Record
EUVD-2021-1662- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-9jxw-cfrh-jxq6
Cachet vulnerable to new line injection during configuration edition
Impact
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.
Patches
This issue was addressed by improving UpdateConfigCommandHandler and preventing the use of new lines characters in new configuration values.
Workarounds
Only allow trusted source IP addresses to access to the administration dashboard.
References
For more information
If you have any questions or comments about this advisory, you can contact:
- The original reporters, by sending an email to vulnerability.research [at] sonarsource.com;
- The maintainers, by opening an issue on this repository.
- Record
GHSA-9jxw-cfrh-jxq6- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-93
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-39172- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.5 Medium
AV:N/AC:L/Au:S/C:P/I:P/A:P - Weakness
- CWE-93
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2021-39172- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVGHSA-9jxw-cfrh-jxq6
Cachet vulnerable to new line injection during configuration edition
Impact
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.
Patches
This issue was addressed by improving UpdateConfigCommandHandler and preventing the use of new lines characters in new configuration values.
Workarounds
Only allow trusted source IP addresses to access to the administration dashboard.
References
For more information
If you have any questions or comments about this advisory, you can contact:
- The original reporters, by sending an email to vulnerability.research [at] sonarsource.com;
- The maintainers, by opening an issue on this repository.
- Record
GHSA-9jxw-cfrh-jxq6- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-93
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
cachethq/cachetPackagist |
before 2.5.1 | 2.5.1 |
cachethq/cachetPackagist |
before 2.5.1, plus listed versions v0.1.0-alphav1.0.0v1.1.0v1.1.1v1.2.0 Show 45 moreShow lessv1.2.1v2.0.0v2.0.0-RC1v2.0.0-RC2v2.0.0-RC3v2.0.0-RC4v2.0.0-RC5v2.0.0-beta1v2.0.0-beta2v2.0.1v2.0.2v2.0.3v2.0.4v2.1.0v2.1.0-RC1v2.1.0-RC2v2.1.1v2.1.2v2.2.0v2.2.0-RC1v2.2.1v2.2.2v2.2.3v2.2.4v2.3.0v2.3.0-RC1v2.3.0-RC2v2.3.0-RC3v2.3.0-RC4v2.3.0-RC5v2.3.0-RC6v2.3.1v2.3.10v2.3.11v2.3.12v2.3.13v2.3.14v2.3.15v2.3.16v2.3.17v2.3.18v2.3.2v2.3.3v2.3.4v2.3.5 |
2.5.1 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | W1ngLess/CVE-2021-39172-RCE | 2022-09-17 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, products | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-39172 is a high vulnerability (CVSS 8.8) in Cachethq Cachet, published August 27, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 29.2%, the 98th percentile. Fixed in cachethq/cachet 2.5.1.
References
github.com/fiveai/Cachet/security/advisories/GHSA-9jxw-cfrh-jxq6
blog.sonarsource.com/cachet-code-execution-via-laravel-configuration-injection
nvd.nist.gov/vuln/detail/CVE-2021-39172
Left out here: 6 versions. The JSON record has them.