Vulnerabilities in pkg:maven/org.yamcs/yamcs-core

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-9272-wg2r-7xmx",
  "modified" : "2026-08-28T17:32:16Z",
  "published" : "2026-08-28T17:32:16Z",
  "aliases" : [ "CVE-2026-55566" ],
  "summary" : "Yamcs has DOM XSS in Extension Routing",
  "details" : "**Attack type**: Unauthenticated remote \n**Impact**: Execution of arbitrary JavaScript in a user’s browser.\n**Affected components**: extension.matcher.ts:12, extension.component.ts:40, app.component.ts:134.\n\nYamcs is vulnerable to cross-site scripting in the /ext URL endpoint. By inputting specially crafted code into the URL, an attacker can execute arbitrary JavaScript code in a user’s browser. This URL may be sent to a user via a phishing email.\n \n<img width=\"940\" height=\"294\" alt=\"image\" src=\"https://github.com/user-attachments/assets/d886d65c-9bb5-4599-ac11-55db83aafc0e\" />\n\nSteps to Reproduce:\n1.\tStart a Yamcs instance.\n2.\tInsert the following URL into the browser and press enter (change ‘myproject’ to the name of your instance):\n```\nhttp://localhost:8090/ext/img%20src%3Dx%20onerror%3Dalert%281%29?c=myproject\n```\n3.\tYou will receive an alert with the number ‘1’ in it.\n\nRecommendations:\n1.\tUse document.createElement instead of innerHTML in extension.component.ts.\n2.\tValidate the extension against registered plugin IDs.\n3.\tEnforce a strict custom-element-name regex before mounting.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.yamcs:yamcs-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.13.0"
      }, {
        "fixed" : "5.13.2"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.13.1"
    }
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.yamcs:yamcs-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.12.8"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.12.7"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/yamcs/yamcs/security/advisories/GHSA-9272-wg2r-7xmx"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yamcs/yamcs/commit/8e18e279d8ce761c21f4f67bbd06a1bff804d297"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yamcs/yamcs/commit/ecf34a4e2ccbe085e6ceff0253595b24d5ecb4aa"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/yamcs/yamcs"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.8"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-28T17:32:16Z",
    "nvd_published_at" : null
  }
}