# Cachet vulnerable to forced reinstall

Advisory record · `GHSA-r67m-m8c7-jp83`

- **Identifiers:** `GHSA-r67m-m8c7-jp83` · `CVE-2021-39173` · `PKSA-qkqp-m22r-mqy1`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **Weakness (CWE):** [CWE-704](https://cwe.mitre.org/data/definitions/704.html)
- **Tags:** [CWE-704](https://agentprime.io/advisories/tag/cwe-704.md)
- **Published:** 30 Aug 2021
- **Updated:** 8 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 30 Aug 2021, 16:11 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `cachethq/cachet` (Packagist): affected `<2.5.1`; fixed in `2.5.1`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Cachet versions before 2.5.1 are vulnerable. An authenticated user with any role, including a regular User, can trick the application into reinstalling the instance, which can lead to arbitrary code execution on the server. Upgrade to Cachet 2.5.1 or later; as a workaround, allow only trusted IP addresses to reach the administration dashboard.

Written 3 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.8 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.024, the 83rd percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:25 UTC: First seen by agentprime
- 31 Oct 2026, 14:25 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-r67m-m8c7-jp83)

## Sources

- [GitHub Advisory Database: GHSA-r67m-m8c7-jp83](https://github.com/advisories/GHSA-r67m-m8c7-jp83)
- [OSV: GHSA-r67m-m8c7-jp83](https://osv.dev/vulnerability/GHSA-r67m-m8c7-jp83)
- <https://github.com/fiveai/Cachet/security/advisories/GHSA-r67m-m8c7-jp83>
- <https://nvd.nist.gov/vuln/detail/CVE-2021-39173>
- <https://blog.sonarsource.com/cachet-code-execution-via-laravel-configuration-injection>
- <https://github.com/fiveai/Cachet>
- <https://github.com/fiveai/Cachet/releases/tag/v2.5.1>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-r67m-m8c7-jp83>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-r67m-m8c7-jp83/>. Everything for agents: <https://agentprime.io/llms.txt>.