linux-entra-sso — security advisory

{
  "id": "bd6c5cce4591046a5d1ad55963ccabacf2d4465d5e9c6519088647cf974c46a1",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-42177",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-42177",
    "summary": "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.",
    "evidence": "osv:DEBIAN-CVE-2026-42177",
    "products": [
      {
        "name": {
          "value": "linux-entra-sso",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.8.1-1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "1.2.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.7.1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.7.2-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.7.2-1~bpo13+1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.8.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.8.0-1~bpo13+1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.8.1-1~bpo13+1",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2026-42177",
      "aliases": [
        "DEBIAN-CVE-2026-42177"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "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"
          }
        }
      ],
      "modified": "2026-10-27T09:47:39.167479215Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-42177"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-42177"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-42177",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 461212,
  "published_at": "2026-05-12T18:17:24.24+00:00"
}