CVE-2026-18423 Details
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.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2026-18423
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.35 Probability of exploitation activity being observed over the next 30 days (29th percentile)
CVSS score for CVE-2026-18423
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
7.1 High
Products affected by CVE-2026-18423
ConcreteCMS 9.1.2
ConcreteCMS 9.1.3
ConcreteCMS 9.2.0
ConcreteCMS 9.2.1
ConcreteCMS 9.2.2
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Low
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CVE-2026-18423 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 506 56.41%
DE 114 12.71%
JP 92 10.26%
NL 37 4.12%
GB 37 4.12%
AU 18 2.01%
DK 16 1.78%
CH 12 1.34%
FR 10 1.11%
CA 10 1.11%

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CVE-2026-18423 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 786 88.51%
Telecommunications 42 4.73%
Education 31 3.49%
Business Services 21 2.36%
Government/Politics 3 0.34%
Finance 3 0.34%
Transportation 2 0.23%

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