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CVE-2026-85538— MISP Attribute Deletion Authorization Bypass Allows Users Without Modify Permissions to Delete Attributes

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.

以下是这段漏洞描述信息的中文翻译，采用了专业的安全公告/技术文档语体： 漏洞描述 MISP 中存在一个授权不当漏洞，允许已认证用户删除事件中的属性，即使他们缺乏所需的 或 权限。 受影响的属性删除路径依赖于 中执行的组织机构成员资格检查，但未一致地执行 MISP 的事件修改授权规则。因此，即使所属角色未被授权修改该事件，属于与某事件关联组织的用户仍有可能删除单个属性或执行批量属性删除操作。 这导致属性编辑与删除之间出现不一致：属性编辑正确使用了 MISP 的 授权逻辑，而受影响的删除操作则可以绕过这些权限检查。 拥

CVSS 8.3 · High EPSS 0.30% · P22

Possible ATT&CK Techniques 2 AI

T1612 · Build Image on Host T1531.001

Affected Version Matrix 1

VendorProduct Version RangeStatus
misp misp ≤ 2.5.45 affected
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I. Basic Information for CVE-2026-85538

Vulnerability Information
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Vulnerability Title
MISP Attribute Deletion Authorization Bypass Allows Users Without Modify Permissions to Delete Attributes
Source: CVE Program / CVE List V5
Vulnerability Description
An incorrect authorization vulnerability in MISP allowed authenticated users to delete attributes from events despite lacking the required perm_modify or perm_modify_org permissions. The affected attribute deletion paths relied on organization membership checks performed by MispAttribute::deleteAttribute() but did not consistently enforce MISP's event modification authorization rules. Consequently, a user belonging to the organization associated with an event could potentially delete individual attributes or perform bulk attribute deletion even when their assigned role was not authorized to modify the event. This created an inconsistency between attribute editing and deletion: editing an attribute correctly used MISP's ACL::canModifyEvent() authorization logic, whereas the affected deletion operations could bypass these permission checks. An authenticated attacker with access to an affected MISP instance and membership in the organization owning an event could exploit this flaw to remove attributes from that event, potentially causing unauthorized modification or loss of threat intelligence data. The patch introduces a common authorization check for all affected deletion paths. Before deletion, MISP now resolves the associated events and verifies that the current user is authorized to modify each event using the same authorization mechanism used by normal event and attribute modification operations.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
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-2026-85538

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III. Intelligence Information for CVE-2026-85538

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Patches & Fixes for CVE-2026-85538 (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-2026-85533 7.6 HIGH MISP Sharing Group Authorization Bypass via Omitted Distribution Parameter
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-863

V. Comments for CVE-2026-85538

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