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CVE-2026-88915— MISP Event Template Instantiation Bypasses Sharing Group and Tagging Authorization

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.

受影响版本的 MISP 在实例化事件模板时，并未始终强制校验当前操作用户的授权权限。 对于使用 的模板，模板可以指定 。在模板实例化的代码路径中，该值被直接传递给事件创建过程，但未验证实例化模板的用户是否实际拥有使用所选共享组的权限。提交记录指出， 仅在另一条代码路径中执行了共享组的授权检查，因此模板实例化路径可以直接写入该标识符，绕过了授权验证。 同一实例化路径还会附带模板中指定的标签，但未检查用户是否具备常规的标签修改权限。此外，该路径硬编码了 ，这意味着标记为 的标签可能被全局附加，进而通过同步或导出机制传播

CVSS 7.1 · High
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I. Basic Information for CVE-2026-88915

Vulnerability Information
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Vulnerability Title
MISP Event Template Instantiation Bypasses Sharing Group and Tagging Authorization
Source: CVE Program / CVE List V5
Vulnerability Description
Affected versions of MISP do not consistently enforce the acting user's authorization when instantiating event templates. For templates using distribution = 4, the template can specify a sharing_group_id. The instantiation path passed that value into event creation without verifying that the user instantiating the template was actually permitted to use the selected sharing group. The commit notes that Event::_add() only performed its own sharing-group authorization in another code path, leaving template instantiation able to write the identifier directly. The same instantiation path also attached template-specified tags without checking the user's normal tagging permissions. In addition, it hardcoded local => 0, meaning tags marked local_only could be attached globally and consequently propagate through synchronization or export, contrary to their intended restriction. The fix adds explicit SharingGroup::canUse() authorization for the acting user, applies the same tag-modification checks used by normal event tagging, and ensures local_only tags are attached locally. 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: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

Affected Products

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

II. Public POCs for CVE-2026-88915

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III. Intelligence Information for CVE-2026-88915

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Patches & Fixes for CVE-2026-88915 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-88915

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