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DEBIAN-CVE-2026-42177

Type: advisorySource: OSV1 source record

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 + "/*", i.e. "https://login.microsoftonline.com/*". Chrome's 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: ["https://*/*"] 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.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-42177

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-42177

linux-entra-sso

Source reference: /affected/0/package/name

Affected versions
1.2.0-1

Source reference: /affected/0/versions

1.7.1-1

Source reference: /affected/0/versions

1.7.2-1

Source reference: /affected/0/versions

1.7.2-1~bpo13+1

Source reference: /affected/0/versions

1.8.0-1

Source reference: /affected/0/versions

1.8.0-1~bpo13+1

Source reference: /affected/0/versions

1.8.1-1~bpo13+1

Source reference: /affected/0/versions

Fixed versions
1.8.1-1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.8.1-1"
          }
        ]
      }
    ],
    "package": {
      "name": "linux-entra-sso",
      "purl": "pkg:deb/debian/linux-entra-sso?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "1.2.0-1",
      "1.7.1-1",
      "1.7.2-1",
      "1.7.2-1~bpo13+1",
      "1.8.0-1",
      "1.8.0-1~bpo13+1",
      "1.8.1-1~bpo13+1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42177.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56933 · Revision 1
Added to Heist Feed
Publisher date
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