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.

Metrics

Attack Vector Network

Attack Complexity High

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Moyangzhan
  • Langchain4j-aideepin

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References
Link Providers
https://github.com/moyangzhan/langchain4j-aideepin/blob/v3.30.0/server/adi-common/src/main/java/com/moyz/adi/common/service/CharacterService.java#L105-L125 cve-icon cve-icon
https://github.com/moyangzhan/langchain4j-aideepin/commit/9b2fee6b66836a0efd5599cfcddd05b80b05ca93 cve-icon cve-icon
https://github.com/moyangzhan/langchain4j-aideepin/issues/116 cve-icon cve-icon
https://github.com/moyangzhan/langchain4j-aideepin/pull/117 cve-icon cve-icon
https://hackmd.io/@hieuPenguinnn/cve-2026-121938-langchain4j-aideepin-character-conversation-cross-user-idor cve-icon cve-icon
https://hackmd.io/@hieuPenguinnn/langchain4j-aideepin-character-conversation-cross-user-idor cve-icon cve-icon
https://www.vulncheck.com/advisories/langchain4j-aideepin-before-3.31.0-idor-via-get-character-uuid cve-icon cve-icon
History

Fri, 06 Nov 2026 22:00:00 +0000

Type Values Removed Values Added
First Time appeared Moyangzhan
Moyangzhan langchain4j-aideepin
Vendors & Products Moyangzhan
Moyangzhan langchain4j-aideepin

Thu, 05 Nov 2026 12:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 04 Nov 2026 19:30:00 +0000

Type Values Removed Values Added
References

Wed, 04 Nov 2026 12:45:00 +0000

Type Values Removed Values Added
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.
Title langchain4j-aideepin before 3.31.0 IDOR via GET /character/{uuid}
Weaknesses CWE-639
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 6, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-11-04T12:31:17.804Z

Updated: 2026-11-04T18:50:28.489Z

Reserved: 2026-11-04T12:05:49.176Z

Link: CVE-2026-121938

cve-icon Vulnrichment

Updated: 2026-11-04T18:50:22.575Z

cve-icon NVD

Status : Deferred

Published: 2026-11-04T13:17:28.040

Modified: 2026-11-12T21:36:06.743

Link: CVE-2026-121938

cve-icon Redhat

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