---
id: "CVE-2026-113600"
kind: "vulnerability"
aliases: ["CVE-2026-113600"]
title: "Fat Free CRM: any logged-in user can edit or delete others' comments"
severity: "medium"
cvss: 5.4
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["fat-free-crm", "package", "rails", "ruby", "self-hosted"]
not_affected_if: ["single-user-instance", "version-0.26.0-or-later"]
published_at: "2026-10-20T16:17:09+00:00"
first_seen_at: "2026-10-23T21:57:20+00:00"
updated_at: "2026-10-25T04:16:31+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-113600", "first_seen_at": "2026-10-23T21:57:20+00:00"}]
---

# Fat Free CRM: any logged-in user can edit or delete others' comments

Fat Free CRM before 0.26.0 lets an authenticated user edit or delete comments written by other users, because the comment update and destroy actions look up records by ID without checking ownership. An attacker only needs a normal account and can walk sequential comment IDs to change or remove comments on contacts, accounts, leads and opportunities.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Fat Free CRM version in the Gemfile.lock for `fat_free_crm` and compare it with `0.26.0`
- Look at app/controllers/comments_controller.rb and confirm whether update and destroy scope Comment.find to the current user

## Fix

- Upgrade the `fat_free_crm` gem to `0.26.0` or later
- Until upgraded, restrict who can create accounts on the instance

## Timeline

- 2026-10-23T21:57:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-113600

## From the sources

Fat Free CRM before 0.26.0 contains an insecure direct object reference vulnerability that allows authenticated users to modify or delete other users' comments because CommentsController#update and #destroy use an unscoped Comment.find without authorization checks. Attackers can send PUT or DELETE requests to /comments/:id with enumerable sequential IDs to edit or delete comments on contacts, accounts, leads, and opportunities owned by others.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_