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CVE-2026-85221— MISP CurlClient TLS Peer Verification Disabled by Default Enables Man-in-the-Middle Attacks

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 在 中存在一个 TLS 证书验证不当的漏洞。 属性未被显式初始化，因此默认为 。当该值传递给 cURL 时，除非调用代码显式启用了该选项，否则 TLS 对等方验证实际上处于禁用状态。 因此，通过受影响的 实例建立的 HTTPS 连接可能会接受并非由受信任的证书颁发机构（CA）签发的证书。能够拦截或篡改 MISP 实例与远程 HTTPS 服务之间网络流量的攻击者，可以冒充该远程端点，从而实施中间人（Man-in-the-Middle）攻击。 成功利用该漏洞后，攻击者可以观察 MISP 传输的敏感信息（包括认

CVSS 7.6 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
misp misp ≤ 2.5.45 affected
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I. Basic Information for CVE-2026-85221

Vulnerability Information
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Vulnerability Title
MISP CurlClient TLS Peer Verification Disabled by Default Enables Man-in-the-Middle Attacks
Source: CVE Program / CVE List V5
Vulnerability Description
MISP contains an improper TLS certificate validation vulnerability in CurlClient. The CurlClient::$verifyPeer property was not explicitly initialized and therefore defaulted to null. When passed to cURL, this value effectively disabled TLS peer verification unless the calling code explicitly enabled it. As a result, HTTPS connections made through affected CurlClient instances could accept certificates that were not issued by a trusted certificate authority. An attacker capable of intercepting or manipulating network traffic between a MISP instance and a remote HTTPS service could impersonate the remote endpoint and perform a man-in-the-middle attack. Successful exploitation could allow an attacker to observe sensitive information transmitted by MISP, including authentication material or exchanged threat intelligence, and to modify responses returned to the MISP instance. The impact depends on the functionality using CurlClient and the data exchanged with the remote service. The patch enables TLS peer verification by default while preserving explicit support for configured self-signed certificates. It also corrects the self-signed certificate handling in SyncTool so that peer verification is disabled only when no pinned CA certificate is configured.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
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-2026-85221

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III. Intelligence Information for CVE-2026-85221

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Patches & Fixes for CVE-2026-85221 (1)

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-2026-85236 8.8 HIGH MISP cullEmptyEvents CSRF Allows Irreversible Deletion of Events via GET Request
CVE-2026-85237 8.6 HIGH Missing Rate Limiting in Email OTP Verification Allows Brute-Force Authentication Bypass
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-295

V. Comments for CVE-2026-85221

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