CVE-2026-18120 Details
Concrete CMS before 9.5.3 exposed a legacy Express entry search endpoint that returned entry result JSON without invoking the canViewExpressEntries() permission check applied by the normal dashboard and CSV Export flow. An unauthenticated visitor who knew or discovered an Express entity identifier could enumerate that entity's entry search results, disclosing attribute values intended to be restricted to privileged users. For Express entities that do not support entry-specific permissions (i.e., supportsEntrySpecificPermissions() returns false), per-entry permission filtering is additionally disabled via EntryList::ignorePermissions(). The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 6.3 with vector CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Daniel Powell for reporting.
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Exploit prediction scoring system (EPSS) score for CVE-2026-18120
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-2026-18120
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.
5.9 Medium
Products affected by CVE-2026-18120
ConcreteCMS 5.4.1.1
ConcreteCMS 5.4.2
ConcreteCMS 5.4.2.1
ConcreteCMS 5.4.2.2
ConcreteCMS 5.6.1
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-2026-18120 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 4,410 35.31%
DE 1,627 13.03%
JP 1,622 12.99%
GB 1,172 9.38%
NL 558 4.47%
CA 485 3.88%
FR 297 2.38%
CH 294 2.35%
AU 263 2.11%
PL 239 1.91%

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CVE-2026-18120 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 9,628 86.92%
Telecommunications 1,125 10.16%
Education 124 1.12%
Business Services 86 0.78%
Government/Politics 28 0.25%
Transportation 12 0.11%
Finance 12 0.11%
Media/Entertainment 11 0.10%
Manufacturing 10 0.09%
Energy/Resources 10 0.09%

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