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CVE-2026-9084— MISP OIDC authentication bypass via automatic email-based account linking under insecure IdP configurations

AI Predicted 8.1 Difficulty: Easy EPSS 0.03% · P8

Possible ATT&CK Techniques 1AI

T1110 · Brute Force

Affected Version Matrix 1

VendorProductVersion RangeStatus
mispmisp2.5.0≤ 2.5.37affected
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I. Basic Information for CVE-2026-9084

Vulnerability Information
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Vulnerability Title
MISP OIDC authentication bypass via automatic email-based account linking under insecure IdP configurations
Source: NVD (National Vulnerability Database)
Vulnerability Description
MISP’s OIDC authentication plugin allowed automatic linking of an OIDC identity to an existing local user account based on the email claim when the local account had no stored sub value. Under insecure or untrusted IdP configurations where email ownership is not enforced, an attacker with a valid OIDC token could assert a victim’s email address and authenticate as that user, leading to account takeover.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
认证机制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
MISP 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MISP是MISP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存在授权问题漏洞，该漏洞源于基于email声明自动链接OIDC身份时未验证邮箱所有权，可能导致攻击者通过断言受害者邮箱地址进行账户接管。
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

VendorProductAffected VersionsCPESubscribe
mispmisp 2.5.0 ~ 2.5.37 -

II. Public POCs for CVE-2026-9084

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III. Intelligence Information for CVE-2026-9084

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Patches & Fixes for CVE-2026-9084 (1)

Same Patch Batch · misp · 2026-05-20 · 3 CVEs total

CVE-2026-9136Unauthorized ShadowAttribute modification in MISP via client-supplied identifier
CVE-2026-9137CSP Report Endpoint Log Flooding via Incorrect Size Limit

IV. Related Vulnerabilities

Same product: misp
Same vendor: misp
Same weakness: CWE-287

V. Comments for CVE-2026-9084

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