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CVE-2026-103235— MISP Event Delegation Mass Assignment Allows Retargeting Delegation to Arbitrary Events

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 的事件委派（event delegation）功能中存在一个批量赋值（mass assignment）漏洞。当拥有委派权限的用户提交委派请求时，应用程序虽然会根据 URL 中指定的事件对用户进行授权检查，但随后却持久化了整个提交的记录，包括由调用方提供的字段（如主键和 event_id）。 经过身份验证的攻击者可以在委派请求的有效载荷中注入特定的主键或 event_id，从而将现有的委派记录重新指向实例中的任意事件。由于委派记录会授予请求方组织对所引用事件的读取权限，这实际上使得攻击者能够获取属于其他组织

CVSS 8.7 · High

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-103235

Vulnerability Information
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Vulnerability Title
MISP Event Delegation Mass Assignment Allows Retargeting Delegation to Arbitrary Events
Source: CVE Program / CVE List V5
Vulnerability Description
MISP contains a mass assignment vulnerability in the event delegation feature. When a user with delegation permission submits a delegation request, the application authorized the user against the event identified in the URL but then persisted the entire submitted record, including caller-supplied fields such as the primary key and event_id. An authenticated attacker could inject a primary key or event_id into the delegation payload to retarget an existing delegation record to any event on the instance. Because a delegation row grants the requesting organisation read access to the event it references, this effectively granted read access to arbitrary events belonging to other organisations. If the target organisation subsequently accepted the delegation, ownership of the event was transferred and the original record was deleted. Preconditions: - An authenticated user with the delegation permission (perm_delegate) - The MISP.delegation server setting must be enabled Impact: - Confidentiality: read access to any event on the instance - Integrity: overwriting existing delegation records and transferring event ownership Affected versions: MISP < 2.5.48
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-915
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MISP MISP 0 ~ 2.5.48 cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-103235

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III. Intelligence Information for CVE-2026-103235

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Other References for CVE-2026-103235 (1)

Same Patch Batch · MISP · 2026-09-30 · 4 CVEs total

CVE-2026-103239 8.6 HIGH MISP Tag Collection Save Allows Privilege Escalation via Sibling Model Injection
CVE-2026-103237 8.3 HIGH MISP: Nested Model Alias Key Bypasses Sanitization to Modify Cross-Tenant Rows
CVE-2026-103321 8.3 HIGH MISP Stored Cross-Site Scripting (XSS) via Unvalidated Event Graph Preview Image

IV. Related Vulnerabilities

Same product: MISP
Same vendor: MISP
Same weakness: CWE-915

V. Comments for CVE-2026-103235

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