{
  "cveId": "CVE-2026-42177",
  "url": "https://patchblox.com/security/cve/CVE-2026-42177",
  "summary": "CVE-2026-42177 is fixed in linux-entra-sso on 1 platform by DEBIAN-CVE-2026-42177 (version 1.8.1-1), released May 27, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux-entra-sso: linux-entra-sso is a browser plugin for Linux to SSO on Microsoft Entra ID",
  "description": "linux-entra-sso is a browser plugin for Linux to SSO on Microsoft Entra ID. Prior to 1.8.1, platform/chrome/js/platform-chrome.js:69-88 registers a single declarativeNetRequest rule whose urlFilter is Platform.SSO_URL \u002B \u0022/*\u0022, i.e. \u0022https://login.microsoftonline.com/*\u0022. Chrome\u0027s urlFilter without a | or || anchor is substring-matched against the full request URL. The same applied rule action is modifyHeaders that attaches the Entra ID Primary Refresh Token cookie. The Firefox adapter in platform/firefox/js/platform-firefox.js:53 performs a belt-and-braces startsWith(Platform.SSO_URL) check before injecting the header; the Chrome adapter does not. When the extension holds broad host permissions through the optional_host_permissions: [\u0022https://*/*\u0022] declared in platform/chrome/manifest.json:34, a main-frame navigation to a URL whose path embeds https://login.microsoftonline.com/ causes Chrome to attach the PRT cookie to the request to the attacker-controlled host. This vulnerability is fixed in 1.8.1.",
  "published": "2026-05-12T18:17:24Z",
  "severity": "medium",
  "cvss": 5.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N",
  "epss": 0.00234,
  "epssPercentile": 0.14428,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux-entra-sso",
      "release": "Debian 14",
      "fixedVersion": "1.8.1-1",
      "fix": "DEBIAN-CVE-2026-42177",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-42177",
      "released": "2026-05-27T17:38:13Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}