moyangzhan langchain4j-aideepin up to 3.30.x Ownership Check CharacterService.detail uuid authorization

Summaryinfo

A vulnerability was found in moyangzhan langchain4j-aideepin up to 3.30.x. It has been rated as problematic. The impacted element is the function CharacterService.detail of the component Ownership Check. This manipulation of the argument uuid causes authorization. This vulnerability appears as CVE-2026-121938. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in moyangzhan langchain4j-aideepin up to 3.30.x. It has been declared as problematic. Affected by this vulnerability is the function CharacterService.detail of the component Ownership Check. The manipulation of the argument uuid with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-121938 since 11/04/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available.

Upgrading to version 3.31.0 eliminates this vulnerability.

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Productinfo

Vendor

• moyangzhan

Name

• langchain4j-aideepin

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16
• 3.17
• 3.18
• 3.19
• 3.20
• 3.21
• 3.22
• 3.23
• 3.24
• 3.25
• 3.26
• 3.27
• 3.28
• 3.29
• 3.30

Website

• Product: https://github.com/moyangzhan/langchain4j-aideepin/

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