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CVE-2026-86347— MISP Missing Authorization on Template File Upload Allows Authenticated Disk Exhaustion

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及之前版本存在安全漏洞，该漏洞源于ACL条目对templates/uploadFile接口使用了通配符*，导致任意已认证用户可绕过角色限制访问文件上传功能，并上传任意内容至app/tmp/files/目录，低权限用户可重复上传文件消耗服务器磁盘空间。

CVSS 7.1 · High EPSS 0.43% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
MISP MISP ≤ 2.5.45 affected
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I. Basic Information for CVE-2026-86347

Vulnerability Information
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Vulnerability Title
MISP Missing Authorization on Template File Upload Allows Authenticated Disk Exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
Affected versions of MISP allow any authenticated user to access TemplatesController::uploadFile() because the ACL entry for templates/uploadFile used the wildcard *. This bypasses the intended role restrictions applied to neighboring template-management operations. The upload handler accepts arbitrary content with only minimal checks and writes it into app/tmp/files/. A low-privileged or read-only user can therefore repeatedly upload files and consume server disk space without requiring perm_add or perm_template. The fix changes the ACL requirement from * to perm_add. The commit also rules out stronger impacts: uploaded files receive random names, path traversal/predictable overwrite is not available, the temporary directory is outside the web root, and the files are not directly served over HTTP. Therefore, the issue should not be described as arbitrary file overwrite, stored XSS, or RCE. 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:N/VI:N/VA:H/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 资源管理错误漏洞
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及之前版本存在安全漏洞，该漏洞源于ACL条目对templates/uploadFile接口使用了通配符*，导致任意已认证用户可绕过角色限制访问文件上传功能，并上传任意内容至app/tmp/files/目录，低权限用户可重复上传文件消耗服务器磁盘空间。
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-2026-86347

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III. Intelligence Information for CVE-2026-86347

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Patches & Fixes for CVE-2026-86347 (1)

Same Patch Batch · MISP · 2026-09-07 · 11 CVEs total

CVE-2026-86452 8.7 HIGH MISP Unauthenticated Mail Endpoints Allow Unbounded Storage Consumption and Request Floodi
CVE-2026-86408 7.1 HIGH MISP Missing Authorization in Cryptographic Key View Exposes Signing Keys from Protected E
CVE-2026-86419 7.0 HIGH MISP Insufficient Outbound URL Validation Allows SSRF and Credential Disclosure via Feed R
CVE-2026-86342 5.3 MEDIUM MISP Freetext Feed Preview Improper Authorization Exposes Restricted Event and Feed Inform
CVE-2026-86417 5.3 MEDIUM MISP Dashboard Template REST API Exposes Template Owner Email Addresses to Unauthorized Us
CVE-2026-86451 5.3 MEDIUM MISP Event Graph Object Reference Lookup Exposes References from Unauthorized Objects
CVE-2026-86351 5.1 MEDIUM MISP User Homepage Validation Allows Authenticated Open Redirect via Protocol-Relative URL
CVE-2026-86440 5.1 MEDIUM MISP Dashboard Button Widget Allows Stored XSS via Unsafe javascript: and Backslash URLs
CVE-2026-86418 2.3 LOW MISP Dashboard Organisation Picker Exposes Hidden Organisation Metadata to Unauthorized Us
CVE-2026-86441 2.3 LOW MISP Dashboard Organisation Widgets Bypass Organisation-Index Restrictions and Expose Hidd

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-86347

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