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CVE-2026-91851— MISP Dashboard Template ACL Bypass Due to VARCHAR-to-Integer Type Coercion in Permission Flag Comparison

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 受影响版本中，仪表盘（Dashboard）模板对特定权限标志的过滤存在缺陷。 具体而言， 方法在判断模板是否可见时，允许显示满足以下任一条件的模板： 模板的 字段值匹配当前用户的任意一个权限标志；或 字段值等于整数 （通常表示“无限制”）。 然而， 字段在数据库中定义为 varchar 类型。在 MySQL 中，当将 varchar 与整数 进行比较时，MySQL 会执行数值强制转换（numeric coercion）。这意味着像 这样的字符串在转换为数值时结果为 （因为字符串以非数字字符开头，MySQL

CVSS 5.3 · Medium
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I. Basic Information for CVE-2026-91851

Vulnerability Information
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Vulnerability Title
MISP Dashboard Template ACL Bypass Due to VARCHAR-to-Integer Type Coercion in Permission Flag Comparison
Source: CVE Program / CVE List V5
Vulnerability Description
Affected versions of MISP incorrectly filter dashboard templates that are restricted to a specific permission flag. DashboardsController::listTemplates() allowed a template when either:  - its restrict_to_permission_flag matched one of the current user’s permission flags, or  - restrict_to_permission_flag equaled integer 0 However, restrict_to_permission_flag is a varchar. MySQL therefore performed numeric coercion when comparing the column against integer 0. Strings such as perm_site_admin convert numerically to zero, making expressions such as perm_site_admin = 0 evaluate true and causing the “unrestricted” branch to match permission-restricted templates as well. 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:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MISP MISP 0 ~ 2.5.46 -

II. Public POCs for CVE-2026-91851

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III. Intelligence Information for CVE-2026-91851

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Patches & Fixes for CVE-2026-91851 (1)

Same Patch Batch · MISP · 2026-09-15 · 6 CVEs total

CVE-2026-91825 7.1 HIGH MISP: Missing Authorization Check for Event Sharing Group When Distribution Field Is Omitt
CVE-2026-91846 7.1 HIGH MISP Collection Element Add Missing Authorization on Referenced Object UUID
CVE-2026-91819 6.9 MEDIUM MISP: HTTP Method Override Bypasses CSRF and Form Validation in BetterSecurityComponent
CVE-2026-91857 5.3 MEDIUM MISP: State-changing actions accessible via GET request enabling CSRF
CVE-2026-91859 5.3 MEDIUM MISP Access Log Entry Overwritten by Error Controller's Second beforeFilter Pass

IV. Related Vulnerabilities

Same product: MISP
Same vendor: MISP
Same weakness: CWE-863

V. Comments for CVE-2026-91851

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