Auth bypass in Fatfreecrm Fat Free Crm
CVE-2026-113600
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/fatfreecrm/fat_free_crm/issues/1650 (issue-tracking)
- github.com/fatfreecrm/fat_free_crm/commit/3c3199328dd10414b1f039ab8e4a82fe0f3ba… (patch)
- github.com/fatfreecrm/fat_free_crm/releases/tag/v0.26.0 (release-notes)
- github.com/fatfreecrm/fat_free_crm/blob/v0.25.0/app/controllers/comments_contro… (technical-description)
- www.vulncheck.com/advisories/fat-free-crm-before-0.26.0-idor-via-commentscontro… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-113600?
- CVE-2026-113600 is a medium-severity vulnerability in Fatfreecrm Fat Free Crm, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.4/10. Published 2026-10-20.
- How severe is CVE-2026-113600?
- Medium severity. CVSS v3 base score is 5.4 out of 10.