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CVE-2026-85533— MISP Sharing Group Authorization Bypass via Omitted Distribution Parameter

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 中存在一个授权缺陷，允许已认证用户在未验证其是否有权使用所引用的共享组（Sharing Group）的情况下提交 。 在多个属性和 Galaxy Cluster 的创建与编辑流程中，对所提交的共享组进行的验证仅在请求显式将 字段设置为 4（即“共享组”）时才会执行。因此，攻击者可以构造一个包含 但省略 参数（或使其不等于 4）的请求，从而跳过针对该共享组的授权检查。 这可能导致拥有创建或修改相关 MISP 对象权限的用户，将数据关联到一个他们无权使用的共享组中。根据受影响对象现有的分发设置及后续处理逻辑，

CVSS 7.6 · High EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1633

Affected Version Matrix 1

VendorProduct Version RangeStatus
misp misp ≤ 2.5.45 affected
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I. Basic Information for CVE-2026-85533

Vulnerability Information
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Vulnerability Title
MISP Sharing Group Authorization Bypass via Omitted Distribution Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
An authorization flaw in MISP allowed an authenticated user to submit a sharing_group_id without verifying that the user was authorized to use the referenced Sharing Group. In several attribute and Galaxy Cluster creation and editing workflows, validation of the submitted Sharing Group was performed only when the request explicitly set the distribution field to 4 ("Sharing Group"). An attacker could therefore craft a request containing a sharing_group_id while omitting the distribution parameter, or otherwise avoiding the distribution == 4 condition, causing the Sharing Group authorization check to be skipped. This could allow a user with permission to create or modify the affected MISP objects to associate data with a Sharing Group that they are not authorized to use. Depending on the affected object's existing distribution settings and subsequent processing, this could bypass intended information-sharing boundaries and result in unauthorized placement or distribution of data to members of another Sharing Group. The issue affected attribute attachment and editing operations as well as Galaxy Cluster creation and editing. The fix ensures that authorization is performed whenever a non-empty sharing_group_id is submitted, independently of the distribution parameter. It also centralizes the authorization decision in SharingGroup::canUse() and explicitly rejects empty Sharing Group identifiers rather than allowing them to be interpreted as an unrestricted query.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/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-2026-85533

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III. Intelligence Information for CVE-2026-85533

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Patches & Fixes for CVE-2026-85533 (1)

Same Patch Batch · misp · 2026-09-04 · 4 CVEs total

CVE-2026-85546 8.6 HIGH MISP Sharing Group Quick-Edit Actions Allow CSRF via State-Changing GET Requests
CVE-2026-85538 8.3 HIGH MISP Attribute Deletion Authorization Bypass Allows Users Without Modify Permissions to De
CVE-2026-85547 6.2 MEDIUM Cross-Site Request Forgery via Attacker-Controlled REST Detection in MISP

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-85533

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