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CVE-2026-18120— Missing Authorization in legacy Express entries search endpoint allows disclosure of Express entry data

Quick assessment

Affected
Concrete CMS Concrete CMS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Concrete CMS 在 9.5.3 版本之前，暴露了一个遗留的 Express 条目搜索端点（endpoint），该端点返回条目结果的 JSON 数据，但并未调用常规仪表板（dashboard）和 CSV 导出流程中所应用的 权限检查。 这意味着，任何知道或发现某个 Express 实体标识符的未认证访客，都可以枚举该实体的条目搜索结果，从而泄露本应仅限特权用户查看的属性值。对于不支持条目级权限控制的 Express 实体（即 返回 的实体），其按条目的权限过滤功能还会通过 被额外禁用。 Concrete C

CVSS 6.3 · Medium EPSS 0.35% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
Concrete CMS Concrete CMS 5.0.0≤ 9.5.2 affected
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I. Basic Information for CVE-2026-18120

Vulnerability Information
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Vulnerability Title
Missing Authorization in legacy Express entries search endpoint allows disclosure of Express entry data
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Concrete CMS Concrete CMS 5.0.0 ~ 9.5.2 -

II. Public POCs for CVE-2026-18120

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III. Intelligence Information for CVE-2026-18120

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Vendor Pages for CVE-2026-18120 (1)

Same Patch Batch · Concrete CMS · 2026-09-16 · 6 CVEs total

CVE-2026-85385 7.7 HIGH Concrete CMS below 9.5.4 is vulnerable to Stored XSS via User Timezone Field
CVE-2026-85386 7.3 HIGH Concrete CMS before 9.5.4 stored is vulneratble to cross-site scripting via unauthenticate
CVE-2026-87028 5.3 MEDIUM Cross-Board IDOR in the Board Custom Slot Preview in Concrete CMS 9.0.0 through 9.5.3 Disc
CVE-2026-87031 2.1 LOW Missing authorization in the REST API user creation endpoint in Concrete CMS 9.2.0 through
CVE-2026-85387 2.0 LOW Concrete CMS before 9.5.4 allows a deactivated user to retain OAuth-authenticated REST API

IV. Related Vulnerabilities

Same product: Concrete CMS
Same vendor: Concrete CMS
Same weakness: CWE-862