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CVE-2026-95671— MISP Collections: Missing Authorization Check for Sharing Group on PUT Request in collections/add

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.

在 MISP 中， 的 方法仅在 HTTP 请求方法为 POST 时执行共享组（sharing-group）可用性授权检查和元素捕获。然而，底层的 方法会在 POST 和 PUT 请求中均持久化数据。因此，经过身份验证的用户可以通过向 端点发起 PUT 请求，完全绕过共享组的授权检查。这使得攻击者能够创建一个分布级别为 4（即与特定共享组共享）的集合，并指向该用户无权使用的共享组。被绕过的检查原本用于验证当前用户是否有权访问指定的共享组，只有验证通过后，集合才能与其关联。 该漏洞的安全影响在于：经过身份验证的用户可

CVSS 5.3 · Medium EPSS 0.37% · P31

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
MISP MISP < 2.5.47 affected
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I. Basic Information for CVE-2026-95671

Vulnerability Information
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Vulnerability Title
MISP Collections: Missing Authorization Check for Sharing Group on PUT Request in collections/add
Source: CVE Program / CVE List V5
Vulnerability Description
In MISP, the CollectionsController add() method enforced the sharing-group usability authorization check and element capture only when the HTTP request method was POST. However, the underlying CRUDComponent::add() method persists data on both POST and PUT requests. As a result, an authenticated user could issue a PUT request to the collections/add endpoint, bypassing the sharing-group authorization check entirely. This allowed the creation of a collection with distribution=4 (shared with a specific sharing group) targeting a sharing group that the user was not authorized to use. The bypassed check would normally verify that the current user has access to the specified sharing group before allowing the collection to be associated with it. The security impact is that an authenticated user can place collection data into a sharing group context they do not have legitimate access to, potentially exposing that data to all members of the unauthorized sharing group and violating the intended access-control boundaries of the MISP instance. The vulnerability requires an authenticated session and knowledge of a valid sharing group identifier; no user interaction or special tooling is needed beyond sending a PUT request instead of a POST request to the same endpoint.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/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 ~ 2.5.47 -

II. Public POCs for CVE-2026-95671

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III. Intelligence Information for CVE-2026-95671

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Patches & Fixes for CVE-2026-95671 (1)

Same Patch Batch · MISP · 2026-09-22 · 19 CVEs total

CVE-2026-95806 7.7 HIGH MISP: PHP phar stream wrapper enables deserialization and code execution via caller-influe
CVE-2026-95658 6.9 MEDIUM MISP CSRF vulnerability in workflow moduleStatelessExecution allows cross-site execution o
CVE-2026-95754 6.9 MEDIUM MISP: Disabled-user check ineffective in pre-authentication TOTP login branch
CVE-2026-95679 6.9 MEDIUM MISP Unauthenticated Blind SSRF via XML Body Processing
CVE-2026-95667 6.9 MEDIUM MISP Installer Log and FIFO Created World-Readable, Exposing Sensitive Credentials
CVE-2026-95697 5.3 MEDIUM MISP: Insufficient Authorization Allows Sharing Group Editors to Overwrite Organization Me
CVE-2026-95805 5.3 MEDIUM MISP ACLComponent: Typo in previewEventAttributes ACL key bypasses intended access restric
CVE-2026-95698 5.3 MEDIUM MISP Path Traversal in OrgImgHelper findOrgImage via Crafted Organization Name
CVE-2026-95693 5.3 MEDIUM MISP Information Disclosure via Forged Upload Path
CVE-2026-95674 5.3 MEDIUM MISP EventsController queryEnrichment allows querying unavailable or legacy modules withou
CVE-2026-95683 5.3 MEDIUM MISP Overmind Event View Discloses Report Content Bypassing Report-Level ACL
CVE-2026-95685 5.3 MEDIUM MISP Missing Authorization on replaceSuggestionInReport Event Report Action
CVE-2026-95661 5.1 MEDIUM MISP Reflected Cross-Site Scripting in Attribute Histogram via Unescaped URL-Supplied Type
CVE-2026-95665 5.1 MEDIUM MISP Reflected Cross-Site Scripting in Event Export Confirmation Form via Unescaped JSON
CVE-2026-95703 5.1 MEDIUM MISP OrganisationsController File Existence and Image-Type Oracle via Forged Upload tmp_na
CVE-2026-95701 5.1 MEDIUM MISP Path Traversal via Organization Name in Org-Statistics Logo Check
CVE-2026-95659 4.8 MEDIUM MISP Reflected XSS via Unvalidated Object Type in AnalystData Overmind Thread
CVE-2026-95682 4.8 MEDIUM MISP Stored Cross-Site Scripting via Unescaped Organization Name in Admin Email View

IV. Related Vulnerabilities

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