Vulnerability-Lookup

GHSA-J5GC-WVRM-78HC

Vulnerability from github – Published: 2026-11-04 15:32 – Updated: 2026-11-04 21:32

Details

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.

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

6.0 (Medium)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-121938"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-11-04T13:17:28Z",
    "severity": "MODERATE"
  },
  "details": "langchain4j-aideepin before 3.31.0 contains an insecure direct object reference vulnerability that allows authenticated users to read other users\u0027 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\u0027 questions, AI answers, and attachment and audio URLs.",
  "id": "GHSA-j5gc-wvrm-78hc",
  "modified": "2026-11-04T21:32:27Z",
  "published": "2026-11-04T15:32:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121938"
    },
    {
      "type": "WEB",
      "url": "https://github.com/moyangzhan/langchain4j-aideepin/issues/116"
    },
    {
      "type": "WEB",
      "url": "https://github.com/moyangzhan/langchain4j-aideepin/pull/117"
    },
    {
      "type": "WEB",
      "url": "https://github.com/moyangzhan/langchain4j-aideepin/commit/9b2fee6b66836a0efd5599cfcddd05b80b05ca93"
    },
    {
      "type": "WEB",
      "url": "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"
    },
    {
      "type": "WEB",
      "url": "https://hackmd.io/@hieuPenguinnn/cve-2026-121938-langchain4j-aideepin-character-conversation-cross-user-idor"
    },
    {
      "type": "WEB",
      "url": "https://hackmd.io/@hieuPenguinnn/langchain4j-aideepin-character-conversation-cross-user-idor"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/langchain4j-aideepin-before-3.31.0-idor-via-get-character-uuid"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-121938 (GCVE-0-2026-121938)

Vulnerability from cvelistv5 – Published: 2026-11-04 12:31 – Updated: 2026-11-04 18:50

Title

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

Summary

Severity

6 (Medium)


                        
                          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

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-11-04 18:50 UTC

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7380 records in the last 180 days details

References

7 references

URL	Tags
https://github.com/moyangzhan/langchain4j-aideepi…	issue-tracking
https://hackmd.io/@hieuPenguinnn/langchain4j-aide…	third-party-advisory
https://github.com/moyangzhan/langchain4j-aideepi…	issue-trackingpatch
https://github.com/moyangzhan/langchain4j-aideepi…	patch
https://github.com/moyangzhan/langchain4j-aideepi…	technical-description
https://www.vulncheck.com/advisories/langchain4j-…	third-party-advisory
https://hackmd.io/@hieuPenguinnn/cve-2026-121938-…	exploit

Impacted products

1 product

Vendor	Product	Version
moyangzhan	langchain4j-aideepin	Affected: 0 , < 3.31.0 (semver)

Date Public

2026-10-22 14:19

Credits

hieuPenguinnn Matthew-james11

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-121938",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-11-04T18:50:02.027188Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-11-04T18:50:28.489Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://hackmd.io/@hieuPenguinnn/cve-2026-121938-langchain4j-aideepin-character-conversation-cross-user-idor"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/moyangzhan/langchain4j-aideepin",
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          "repo": "https://github.com/moyangzhan/langchain4j-aideepin",
          "vendor": "moyangzhan",
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        }
      ],
      "metrics": [
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          "cvssV4_0": {
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
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            "baseScore": 6,
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            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
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          "tags": [
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        },
        {
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          "url": "https://github.com/moyangzhan/langchain4j-aideepin/pull/117"
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        },
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          "tags": [
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    "datePublished": "2026-11-04T12:31:17.804Z",
    "dateReserved": "2026-11-04T12:05:49.176Z",
    "dateUpdated": "2026-11-04T18:50:28.489Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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