Origin Validation Error Affecting firefox package, versions <0:140.17.0-1.el9_8


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.17% (6th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-RHEL9-FIREFOX-21692604
  • published24 Oct 2026
  • disclosed29 Sept 2026

Introduced: 29 Sep 2026

NewCVE-2026-100803  (opens in a new tab)
CWE-346  (opens in a new tab)

How to fix?

Upgrade RHEL:9 firefox to version 0:140.17.0-1.el9_8 or higher.
This issue was patched in RHSA-2026:76761.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox package and not the firefox package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

Same-origin policy bypass in the WebExtensions component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

CVSS Base Scores

version 3.1