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CVE-2026-85236— MISP cullEmptyEvents CSRF Allows Irreversible Deletion of Events via GET Request

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 中的 动作存在跨站请求伪造（CSRF）漏洞。该端点在接受 HTTP GET 请求的同时，执行了具有状态变更且不可逆的操作。 由于不带请求体的 GET 请求不受 CakePHP 的 CSRF 校验保护，攻击者可以构造一个精心设计的 URL，例如通过嵌入的图片或其他自动加载的资源，诱导具有相应权限的已认证 MISP 用户的浏览器自动访问该端点，从而触发漏洞。 成功利用该漏洞会触发已发布空事件（empty events）的删除。这一删除操作具有特殊重要性，因为该操作使用了 ，意味着被删除的事件不会生成黑名单（b

CVSS 8.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
misp misp ≤ 2.5.45 affected
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I. Basic Information for CVE-2026-85236

Vulnerability Information
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Vulnerability Title
MISP cullEmptyEvents CSRF Allows Irreversible Deletion of Events via GET Request
Source: CVE Program / CVE List V5
Vulnerability Description
A cross-site request forgery (CSRF) vulnerability existed in the cullEmptyEvents action of MISP. The endpoint performed a state-changing and irreversible operation while accepting HTTP GET requests. Because bodyless GET requests are not subject to CakePHP's CSRF validation, an attacker could cause an authenticated MISP user with sufficient privileges to invoke the endpoint simply by causing their browser to load a crafted URL, for example through an embedded image or other automatically requested resource. Successful exploitation triggers the deletion of published empty events. The deletion is particularly significant because the operation uses skipBlocklist, meaning the removed events do not leave blocklist entries that could prevent or track their subsequent synchronization. This can result in unintended and potentially irreversible deletion of MISP event records without explicit user interaction. The vulnerability was addressed by restricting cullEmptyEvents to HTTP POST requests, ensuring that CakePHP's normal CSRF protections are applied to the operation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
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-2026-85236

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III. Intelligence Information for CVE-2026-85236

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Patches & Fixes for CVE-2026-85236 (5)

Same Patch Batch · misp · 2026-09-03 · 9 CVEs total

CVE-2026-85216 9.5 CRITICAL MISP LDAP and LinOTP Authentication Bypass via Empty or Invalid Credentials
CVE-2026-85237 8.6 HIGH Missing Rate Limiting in Email OTP Verification Allows Brute-Force Authentication Bypass
CVE-2026-85221 7.6 HIGH MISP CurlClient TLS Peer Verification Disabled by Default Enables Man-in-the-Middle Attack
CVE-2026-85238 7.6 HIGH Session Fixation in MISP CustomAuth Authentication Allows Session Hijacking
CVE-2026-85239 7.1 HIGH MISP Event Template Definition Validation Bypass Allows Persistent Denial of Service
CVE-2026-85227 6.1 MEDIUM Reflected Cross-Site Scripting in MISP Event Filtering via taggedAttributes and galaxyAtta
CVE-2026-85226 5.3 MEDIUM MISP OnDemand Correlation Engine Missing Access Control Allows Disclosure of Restricted Co
CVE-2026-85230 5.3 MEDIUM MISP Dashboard Button Widget Allows Persistent JavaScript URL Injection

IV. Related Vulnerabilities

Same product: misp
Same vendor: misp
Same weakness: CWE-352

V. Comments for CVE-2026-85236

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