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CVE-2026-86283— MISP UiBeta Collection View Bypasses Event ACL, Exposing Unauthorized Event Data

Quick assessment

Affected
MISP MISP
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.

MISP 的 UiBeta 主题集合视图（ ）在对成员事件执行二次查询时，未应用调用者的访问控制列表（ACL）。 具体而言， 动作通过 正确解析了集合元素的 UUID，该函数强制执行基于用户的事件 ACL。然而，视图模板独立地重新查询了相同的 UUID，仅使用了 条件，却遗漏了 授权过滤器。 由于集合元素的 UUID 在存储时并未对引用的事件进行服务端授权校验（ 接受集合所有者提交的任意 UUID），拥有对某集合的查看权限的已认证用户，有可能获取到他们本无权读取的事件的完整详情。 泄露的数据包括：事件标识符、信息字

CVSS 7.1 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
MISP MISP ≤ 2.5.45 affected
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I. Basic Information for CVE-2026-86283

Vulnerability Information
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Vulnerability Title
MISP UiBeta Collection View Bypasses Event ACL, Exposing Unauthorized Event Data
Source: CVE Program / CVE List V5
Vulnerability Description
MISP's UiBeta theme collection view (app/View/Themed/UiBeta/Collections/view.ctp) performed a secondary query of member events by UUID without applying the caller's access control list (ACL). The CollectionsController::view() action correctly resolved collection element UUIDs through Event::fetchSimpleEvents($user, ...), which enforces per-user event ACL. However, the view template independently re-queried the same UUIDs using only an Event.uuid IN (...) condition, omitting the createEventConditions() authorization filter. Because collection element UUIDs are stored without server-side authorization against the referenced event (CollectionElementsController::add() accepts whatever UUID the collection owner posts), an authenticated user with view access to a collection could retrieve full details of events they are not permitted to read. The exposed data included event identifiers, info, dates, timestamps, creator organization, all event tags, and galaxy clusters (the latter attached via a cluster-scoped rather than event-scoped ACL check). This constitutes an authorization bypass at the presentation layer, allowing horizontal privilege escalation across event boundaries within the MISP instance.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/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
MISP MISP 0 ~ 2.5.45 -

II. Public POCs for CVE-2026-86283

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III. Intelligence Information for CVE-2026-86283

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Patches & Fixes for CVE-2026-86283 (1)

IV. Related Vulnerabilities

Same product: MISP
Same vendor: MISP
Same weakness: CWE-862

V. Comments for CVE-2026-86283

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