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CVE-2026-107856— CiviForm: Trusted-Intermediary IDOR discloses any citizen's name and email

Quick assessment

Affected
civiform civiform
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.

CiviForm 通过在不同福利申请中复用申请人数据，简化了政府福利项目的申请流程。在 3.33.0 版本之前，GET /admin/tiDash/editClientForm/:accountId 端点会验证请求者是否为可信中介（Trusted Intermediary），但 showEditClientForm 函数会直接执行原始查找（lookupAccount(accountId)），未确认该公民账户是否属于请求者所属的可信中介组。因此，经过身份认证的可信中介可以枚举 accountId 值，并读取不在其可信

CVSS 4.5 · Medium

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-107856

Vulnerability Information
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Vulnerability Title
CiviForm: Trusted-Intermediary IDOR discloses any citizen's name and email
Source: CVE Program / CVE List V5
Vulnerability Description
CiviForm simplifies applications for government benefits programs by reusing applicant data across multiple benefit applications. Prior to 3.33.0, GET /admin/tiDash/editClientForm/:accountId verifies that the requester is a Trusted Intermediary but showEditClientForm performs a raw lookupAccount(accountId) without confirming that the citizen account belongs to the requester's trustedIntermediaryGroup. An authenticated Trusted Intermediary can enumerate accountId values and read the applicant display name, including the citizen's name and email address, for accounts outside the intermediary's group. This issue is fixed in version 3.33.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
civiform civiform < 3.33.0 -

II. Public POCs for CVE-2026-107856

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III. Intelligence Information for CVE-2026-107856

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Other References for CVE-2026-107856 (4)

IV. Related Vulnerabilities

Same weakness: CWE-639

V. Comments for CVE-2026-107856

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