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CVE-2026-56423— MISP Core: Broken access control allows instance-wide unauthorized deletion of event reports and sharing groups via bulk deletion endpoints

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 2.5.41及之前版本存在授权问题漏洞，该漏洞源于在Event Reports和Sharing Groups的批量删除流程中访问控制检查失效，导致deleteSelection处理程序使用宽泛的角色权限而非验证每个对象的授权，可能造成已认证的攻击者利用相关权限删除其组织授权范围外的对象，导致事件报告内容或共享组配置丢失。

AI Predicted 6.5 Difficulty: Easy EPSS 0.47% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
misp misp ≤ 2.5.41 affected
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I. Basic Information for CVE-2026-56423

Vulnerability Information
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Vulnerability Title
MISP Core: Broken access control allows instance-wide unauthorized deletion of event reports and sharing groups via bulk deletion endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
MISP Core contained broken access-control checks in the bulk deletion flows for Event Reports and Sharing Groups. The affected deleteSelection handlers authorized deletion using broad role-level permissions instead of validating authorization for each selected object. For Event Reports, EventReportsController::deleteSelection relied on the global perm_add capability rather than a per-report ownership/authorization check. As a result, a contributor-level user could submit report IDs or UUIDs for reports belonging to other organisations and hard-delete them instance-wide. The fix changed the callback to call EventReport::fetchIfAuthorized($user, $itemId, 'delete') for each selected report before deletion. For Sharing Groups, SharingGroupsController::deleteSelection relied on the global perm_sharing_group capability rather than verifying ownership of each selected sharing group. This allowed a sharing-group-capable user to hard-delete sharing groups owned by other organisations, bypassing the per-object ownership gate used by the single-object delete action. The fix changed the callback to call SharingGroup::checkIfOwner($user, $itemId) for each selected sharing group. An authenticated attacker with the relevant broad role permission could abuse the affected bulk deletion endpoints to delete objects outside their organisation’s authorization scope, causing loss of event-report content or sharing-group configuration across the instance.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
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 2.5.41及之前版本存在授权问题漏洞，该漏洞源于在Event Reports和Sharing Groups的批量删除流程中访问控制检查失效，导致deleteSelection处理程序使用宽泛的角色权限而非验证每个对象的授权，可能造成已认证的攻击者利用相关权限删除其组织授权范围外的对象，导致事件报告内容或共享组配置丢失。
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 ~ 2.5.41 -

II. Public POCs for CVE-2026-56423

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III. Intelligence Information for CVE-2026-56423

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Patches & Fixes for CVE-2026-56423 (2)

Same Patch Batch · misp · 2026-06-22 · 6 CVEs total

CVE-2026-56447 MISP remote code execution via arbitrary rdkafka configuration path
CVE-2026-56424 Broken access control in MISP core allows cross-organization unauthorized modification or
CVE-2026-56446 Authenticated Remote Code Execution via Arbitrary NDJSON Error Log Path in MISP
CVE-2026-56425 MISP AAD authentication plugin - Improper OAuth State Handling, Missing Session Rotation,
CVE-2026-56422 MISP Core: Mass Assignment and Object Re-ownership via Unvalidated Request Fields

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-56423

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