DEBIAN-CVE-2026-42177
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.
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/versions1.7.1-1Source reference:
/affected/0/versions1.7.2-1Source reference:
/affected/0/versions1.7.2-1~bpo13+1Source reference:
/affected/0/versions1.8.0-1Source reference:
/affected/0/versions1.8.0-1~bpo13+1Source reference:
/affected/0/versions1.8.1-1~bpo13+1Source 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