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CVE-2026-10855— MISP Event template importer authorization bypass

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开源的一套开源的软件解决方案。该产品用于收集、存储、分发、共享网络安全指标，并具有威胁网络安全事件分析和恶意软件分析等功能。 MISP存在安全漏洞，该漏洞源于覆盖工作流中的授权缺陷，可能导致经过身份验证的用户强制覆盖其他组织拥有的事件模板。

AI Predicted 6.5 Difficulty: Easy EPSS 0.15% · P5

Affected Version Matrix 1

VendorProduct Version RangeStatus
misp misp ≤ 2.5.38 affected
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I. Basic Information for CVE-2026-10855

Vulnerability Information
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Vulnerability Title
MISP Event template importer authorization bypass
Source: CVE Program / CVE List V5
Vulnerability Description
An authorization flaw existed in the MISP Event Template Importer overwrite workflow. When importing an event template in overwrite mode, the application checked whether a matching template already existed but did not verify that the importing user belonged to the organization that owned the existing template. As a result, an authenticated user with access to the template import functionality could forcibly overwrite an event template owned by another organization. Successful exploitation could allow unauthorized modification of another organization’s event template, potentially altering template structure, attributes, or metadata used for subsequent event creation or sharing workflows. Site administrators are not affected by this restriction, as they are explicitly allowed to overwrite templates across organizations. The issue was fixed by enforcing an ownership check before overwrite: non-site-admin users may only overwrite templates owned by their own organization.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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
Vulnerability Title
MISP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MISP是MISP开源的一套开源的软件解决方案。该产品用于收集、存储、分发、共享网络安全指标，并具有威胁网络安全事件分析和恶意软件分析等功能。 MISP存在安全漏洞，该漏洞源于覆盖工作流中的授权缺陷，可能导致经过身份验证的用户强制覆盖其他组织拥有的事件模板。
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 ~ 2.5.38 -

II. Public POCs for CVE-2026-10855

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III. Intelligence Information for CVE-2026-10855

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Patches & Fixes for CVE-2026-10855 (1)

Same Patch Batch · misp · 2026-06-04 · 8 CVEs total

CVE-2026-10860 MISP CRUDComponent delete validation bypass via operator precedence error
CVE-2026-10854 Unauthorized exposure of private galaxies in MISP event template creation
CVE-2026-10856 Open redirect in MISP dashboard button widget URL handling
CVE-2026-10863 MISP User-controlled order parameter in correlations over-correlation endpoint
CVE-2026-10864 MISP Dashboard widget field selection may expose restricted user and organisation data
CVE-2026-10868 MISP user edit endpoint mass assignment vulnerability allows unauthorized user account mod
CVE-2026-10861 MISP post-login open redirect via pre_login_requested_url

IV. Related Vulnerabilities

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