CVE-2026-121938: moyangzhan langchain4j-aideepin

langchain4j-aideepin before 3.31.0 IDOR via GET /character/{uuid}

CVSS 6.0 MediumEPSS 0.0039 · 33rd percentile

Published by the CVE Program (CNA: VulnCheck) at 4 Nov 2026, 12:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
moyangzhan	langchain4j-aideepin pkg:github/moyangzhan/langchain4j-aideepin	affected before 3.31.0 semver Other versions: unaffected

Identifiers

CVE-2026-121938

CNA

VulnCheck

Weakness (CWE)

CWE-639

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.0	Medium	4.0	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	CNA (VulnCheck)Used for this record
5.3	Medium	3.1	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0039, the 33rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

4 Nov 2026, 12:31 UTC Confirmed by the CVE List
4 Nov 2026, 12:39 UTC First seen by agentprime
4 Nov 2026, 13:17 UTC Confirmed by NVD

Sources

References from the CNA

github.com/moyangzhan/langchain4j-aideepin/issues/116 issue-tracking
hackmd.io/@hieuPenguinnn/langchain4j-aideepin-character-conversation-cross-user-idor third-party-advisory
github.com/moyangzhan/langchain4j-aideepin/pull/117 issue-trackingpatch
github.com/moyangzhan/langchain4j-aideepin/commit/9b2fee6b66836a0efd5599cfcddd05b80b05ca93 patch
github.com/moyangzhan/langchain4j-aideepin/blob/v3.30.0/server/adi-common/src/main/java/com/moyz/adi/common/service/CharacterService.java#L105-L125 technical-description
www.vulncheck.com/advisories/langchain4j-aideepin-before-3.31.0-idor-via-get-character-uuid third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.