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PatchSiren cyber security CVE debrief

CVE-2026-113600 fatfreecrm CVE debrief

CVE-2026-113600 is a medium-severity insecure direct object reference vulnerability in Fat Free CRM before 0.26.0. This vulnerability allows authenticated users to modify or delete comments belonging to other users due to an unscoped Comment.find method without proper authorization checks in the CommentsController. The likely operational impact includes unauthorized modification or deletion of comments on contacts, accounts, leads, and opportunities. Defenders should prioritize patching and monitoring for suspicious activity with a focus on authenticated user sessions and comment management functionality.

Vendor
fatfreecrm
Product
fat_free_crm
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-20
Original CVE updated
2026-10-23
Advisory published
2026-10-20
Advisory updated
2026-10-23

Who should care

Defenders responsible for Fat Free CRM deployments should assess exposure and prioritize patching. Authenticated user sessions and comment management functionality are key areas of focus.

Why it matters

CVE-2026-113600 is a medium-severity vulnerability in Fat Free CRM before 0.26.0 that allows authenticated users to modify or delete other users' comments. Defenders should prioritize patching and monitoring for suspicious activity.

  • Modification or deletion of comments by unauthorized users
  • Potential data integrity issues for CRM records
  • Increased monitoring requirements for suspicious activity
  • Verification of patch application and user access controls

Technical summary

The Fat Free CRM application before version 0.26.0 contains an insecure direct object reference vulnerability. This vulnerability, located in the CommentsController, allows authenticated users to modify or delete comments belonging to other users. The issue arises from the use of an unscoped Comment.find method without proper authorization checks. An attacker can exploit this by sending PUT or DELETE requests to /comments/:id with sequential IDs to edit or delete comments on contacts, accounts, leads, and opportunities owned by others.

Defensive priority

Medium priority for authenticated user sessions

Recommended defensive actions

  • Verify and apply the patch from version 0.26.0
  • Restrict access to authenticated users with comment modification or deletion privileges
  • Monitor for suspicious comment modification or deletion activity
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

Official CVE Program and NVD records confirm an insecure direct object reference vulnerability in Fat Free CRM before 0.26.0, allowing authenticated users to modify or delete other users' comments. The CVE record was published on 2026-10-20T15:40:28.303Z and has not been modified since then. The vulnerability is located in the CommentsController and arises from the use of an unscoped Comment.find method without proper authorization checks.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-113600 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-113600

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-113600 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-113600

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Fat Free CRM before 0.26.0 IDOR via CommentsController update and destroy

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/113xxx/CVE-2026-113600.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://github.com/fatfreecrm/fat_free_crm/issues/1650

    Supplemental source - issue-tracking

  • Source reference

    Unverified legacy reference

    URL: https://github.com/fatfreecrm/fat_free_crm/commit/3c3199328dd10414b1f039ab8e4a82fe0f3baf87

    Supplemental source - patch

  • Source reference

    Unverified legacy reference

    URL: https://github.com/fatfreecrm/fat_free_crm/releases/tag/v0.26.0

    Supplemental source - release-notes

  • Source reference

    Unverified legacy reference

    URL: https://github.com/fatfreecrm/fat_free_crm/blob/v0.25.0/app/controllers/comments_controller.rb

    Supplemental source - technical-description

  • Source reference

    Unverified legacy reference

    URL: https://www.vulncheck.com/advisories/fat-free-crm-before-0.26.0-idor-via-commentscontroller-update-and-destroy

    Supplemental source - third-party-advisory

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.