# CVE-2026-18423

## Summary

- **CVE ID:** CVE-2026-18423
- **Severity:** LOW
- **CVSS Score:** 2.1 (CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N)
- **CWE:** CWE-639
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 2026

## Description

Concrete CMS 9.0.0 through 9.5.2 is vulnerable to Insecure direct object reference (IDOR)  in the Express saved search preset delete and edit dialogs . An authenticated user holding only view permission on a single Express entity could therefore permanently delete, with no undo, or rename saved search presets owned by Express entities for which they had no permission, and a renamed preset name was displayed back to users of the targeted entity, enabling defacement or social engineering. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.1 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N. Thanks Yalguun Tumenkhuu ( fg0x0 ) for reporting.

## Affected Products

- Concrete CMS — Concrete CMS (9.0.0)

## References

- [CNA](https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.28%
- **EPSS Percentile:** 20.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._