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CVE-2026-86342— MISP Freetext Feed Preview Improper Authorization Exposes Restricted Event and Feed Information

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.

以下是对该漏洞描述信息的中文翻译，已进行技术术语的标准化处理，确保专业性和准确性： 受影响版本的 MISP 在自由文本（freetext）源预览功能中存在授权检查不当的问题。预览过程中的相关性查找（correlation lookups）未应用请求用户的访问控制列表（ACL），导致受限事件的相关性关联及关联事件信息暴露给本无权访问这些事件的用户。受影响的查询仅基于属性值和删除状态进行筛选，而未纳入 MISP 在事件、组织、共享组、属性及对象层面的访问控制机制。 同一预览功能在未根据调用者可见范围限制源列表的情况下，

CVSS 5.3 · Medium
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I. Basic Information for CVE-2026-86342

Vulnerability Information
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Vulnerability Title
MISP Freetext Feed Preview Improper Authorization Exposes Restricted Event and Feed Information
Source: CVE Program / CVE List V5
Vulnerability Description
Affected versions of MISP contain improper authorization checks in the freetext feed preview functionality. The preview performed correlation lookups against attributes from events without applying the requesting user's ACL, allowing restricted event correlations and associated event information to be exposed to users who could not otherwise access those events. The vulnerable queries were scoped only by attribute values and deletion status rather than MISP's event, organization, sharing-group, attribute, and object-level access controls. The same preview functionality also returned cross-feed correlation information without properly restricting the feed list to feeds visible to the caller. This exposed metadata for feeds that were not marked lookup_visible; one affected response additionally included the configured feed URL even though that value was not required by the feature. The fixes apply the caller's ACL to attribute correlation searches, remove feed URLs from correlation results, restrict cross-feed results according to feed visibility, and correct host-organization ID comparison so the authorization rules are applied consistently. Version affected: ≤2.5.45
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
MISP MISP 0 ~ 2.5.45 -

II. Public POCs for CVE-2026-86342

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III. Intelligence Information for CVE-2026-86342

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Other References for CVE-2026-86342 (4)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-86342

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