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CVE-2026-121938— langchain4j-aideepin before 3.31.0 IDOR via GET /character/{uuid}

Quick assessment

Affected
moyangzhan langchain4j-aideepin
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.

在 3.31.0 版本之前，langchain4j-aideepin 存在不安全的直接对象引用漏洞。该漏洞允许已认证用户通过提供其他用户的角色 UUID，读取他人的角色对话记录。攻击者可发送 GET /character/{uuid} 请求，而 CharacterService.detail 方法在未进行所有权校验的情况下直接解析该请求，从而获取受害者的提问内容、AI 回复以及附件和音频的 URL。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-121938

Vulnerability Information
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Vulnerability Title
langchain4j-aideepin before 3.31.0 IDOR via GET /character/{uuid}
Source: CVE Program / CVE List V5
Vulnerability Description
langchain4j-aideepin before 3.31.0 contains an insecure direct object reference vulnerability that allows authenticated users to read other users' character-chat conversations by supplying their character uuid. Attackers can request GET /character/{uuid}, which CharacterService.detail resolves without an ownership check, to obtain victims' questions, AI answers, and attachment and audio URLs.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/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
moyangzhan langchain4j-aideepin 0 ~ 3.31.0 -

II. Public POCs for CVE-2026-121938

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III. Intelligence Information for CVE-2026-121938

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Other References for CVE-2026-121938 (6)

IV. Related Vulnerabilities

Same product: langchain4j-aideepin
Same vendor: moyangzhan
Same weakness: CWE-639