Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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是MISP组织开源的一个威胁情报共享与分析平台。 MISP 2.5.45及之前版本存在授权问题漏洞，该漏洞源于授权验证缺陷，允许已认证用户提交sharing_group_id而不验证其是否有权使用引用的共享组，可能导致绕过信息共享边界，将数据未经授权放置或分发给其他共享组成员。

CVSS 7.6 · High EPSS 0.37% · P31

Possible ATT&CK Techniques 1 AI

T1633

Affected Version Matrix 1

VendorProduct Version RangeStatus
misp misp ≤ 2.5.45 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-85533

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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
Vulnerability Title
MISP 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MISP是MISP组织开源的一个威胁情报共享与分析平台。 MISP 2.5.45及之前版本存在授权问题漏洞，该漏洞源于授权验证缺陷，允许已认证用户提交sharing_group_id而不验证其是否有权使用引用的共享组，可能导致绕过信息共享边界，将数据未经授权放置或分发给其他共享组成员。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
misp misp 0 ~ 2.5.45 -

II. Public POCs for CVE-2026-85533

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-85533

请登录查看更多情报信息。

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