CVE-2026-42177

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Source

https://cve.org/CVERecord?id=CVE-2026-42177

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42177.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-42177

Aliases

GHSA-52rj-42vh-2rxc

Downstream

DEBIAN-CVE-2026-42177

UBUNTU-CVE-2026-42177

Published

2026-05-12T17:11:36.050Z

Modified

2026-08-12T03:51:13.191975945Z

Severity

5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N CVSS Calculator

Summary

linux-entra-sso: PRT SSO cookie can leak to attacker-controlled hosts when broad host permissions are granted

Details

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.SSOURL + "/", 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.SSOURL) check before injecting the header; the Chrome adapter does not. When the extension holds broad host permissions through the optionalhostpermissions: ["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.

Database specific

{
    "cwe_ids": [
        "CWE-284",
        "CWE-436"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42177.json"
}

References

Affected packages

Git / github.com/siemens/linux-entra-sso

Affected ranges

Type

GIT

Repo

https://github.com/siemens/linux-entra-sso

Events

Introduced

Fixed

88fb9104ebf584b30c8a0a032f85b9604465d251

Database specific

Show details

{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.8.1"
        }
    ]
}

Affected versions

v0.*

v0.6.1

v0.7

v0.8

v0.9

v1.*

v1.0

v1.1.0

v1.2.0

v1.3.0

v1.3.1

v1.4.0

v1.5.0

v1.5.1

v1.6.0

v1.7.0

v1.7.1

v1.7.2

v1.8.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42177.json"