What’s Vulnerable › Vulnerabilities

CVE-2026-113600: Fat Free CRM before 0.26.0 IDOR via CommentsController update and destroy

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-20 · updated 2026-10-23
• Weakness: CWE-639

Description

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.

Affected products

• fatfreecrm fat_free_crm: before 0.26.0 — fixed in 0.26.0

How to fix

Upgrade to a fixed version: fatfreecrm fat_free_crm 0.26.0. Check the vendor advisory for mitigations.

References

• https://github.com/fatfreecrm/fat_free_crm/blob/v0.25.0/app/controllers/comments_controller.rb
• https://github.com/fatfreecrm/fat_free_crm/commit/3c3199328dd10414b1f039ab8e4a82fe0f3baf87
• https://github.com/fatfreecrm/fat_free_crm/issues/1650
• https://github.com/fatfreecrm/fat_free_crm/releases/tag/v0.26.0
• https://www.vulncheck.com/advisories/fat-free-crm-before-0.26.0-idor-via-commentscontroller-update-and-destroy

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