jeremyckahn Chitchatter PostMessage Bootstrap.tsx isConfigMessageEvent improper authentication

{
  "id": "b9ff296060780584fc46c79e9655cddf3c757868a84ee77a226da434f4639594",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-118129",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "jeremyckahn Chitchatter PostMessage Bootstrap.tsx isConfigMessageEvent improper authentication",
    "summary": "A vulnerability was found in jeremyckahn Chitchatter up to f82538633813c854a81a8b2112a2f6ba17b39cbc. The affected element is the function isConfigMessageEvent of the file src/Bootstrap.tsx of the component PostMessage Handler. Performing a manipulation of the argument parentDomain results in improper authentication. Remote exploitation of the attack is possible. The exploit has been made public and could be used. This product follows a rolling release approach for continuous delivery, so version details for affected or updated releases are not provided. The patch is named e3babb5cd83bfe3b99f1d82358ac5c1ea8e8a688. It is recommended to apply a patch to fix this issue. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.",
    "evidence": "cve:CVE-2026-118129",
    "products": [
      {
        "name": {
          "value": "Chitchatter",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-118129",
      "aliases": [
        "CVE-2026-118129"
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "version": "4.0",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P"
          }
        },
        {
          "cvssV3_1": {
            "version": "3.1",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C"
          }
        },
        {
          "cvssV3_0": {
            "version": "3.0",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C"
          }
        },
        {
          "cvssV2_0": {
            "version": "2.0",
            "baseScore": 7.5,
            "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C"
          }
        }
      ],
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:jeremyckahn:chitchatter:*:*:*:*:*:*:*:*"
          ],
          "vendor": "jeremyckahn",
          "modules": [
            "PostMessage Handler"
          ],
          "product": "Chitchatter",
          "versions": [
            {
              "status": "affected",
              "version": "f82538633813c854a81a8b2112a2f6ba17b39cbc"
            }
          ]
        }
      ],
      "modified": "2026-10-27T23:15:19.571Z",
      "provider": "cve",
      "references": [
        "https://vuldb.com/vuln/427456",
        "https://vuldb.com/vuln/427456/cti",
        "https://vuldb.com/cve/CVE-2026-118129",
        "https://vuldb.com/submit/1015027",
        "https://github.com/0xGenesi/CVE/blob/main/Chitchatter_SDK_postMessage_Identity_Key_Injection.md",
        "https://github.com/jeremyckahn/chitchatter/pull/635",
        "https://github.com/jeremyckahn/chitchatter/commit/e3babb5cd83bfe3b99f1d82358ac5c1ea8e8a688",
        "https://github.com/jeremyckahn/chitchatter/"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
          "shortName": "VulDB",
          "dateUpdated": "2026-10-27T23:15:19.571Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-118129",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 400748,
  "published_at": "2026-10-27T23:15:19.571+00:00"
}