CVE-2026-121938

Medium

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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductLangchain4j-aideepin

PublishedNov 4, 2026

First seenNov 4, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

langchain4j-aideepin3.31.0 or later

Patches

Affected products

Product	Affected versions	Fixed in
langchain4j-aideepin	No range specified	3.31.0

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