CVE-2026-8948 Details
Description
Same-origin policy bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
A same-origin policy bypass vulnerability has been identified in the DOM: Networking component of Mozilla Firefox. This vulnerability allows for unauthorized access or manipulation of resources from different origins, potentially leading to security issues such as cross-site request forgery or data theft. The vulnerability affects Firefox versions prior to 151.
Users can upgrade to Firefox 151 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 19, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-8948 | redhat-SADP | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2479850 | redhat-SADP | |
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8948.json | redhat-SADP | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=2038803 | [email protected] | Permissions Required |
| https://www.mozilla.org/security/advisories/mfsa2026-46/ | [email protected] | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-50/ | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | redhat-SADP |
| CWE-942 | Permissive Cross-domain Policy with Untrusted Domains | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| mozilla firefox | < 151.0.0 |
CPE
Remediation
| |
| mozilla thunderbird | < 151.0.0 |
CPE
Remediation
| |
Change History
8 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 15, 2026 | CVE Modified | redhat-SADP |
| Jun 30, 2026 | CVE Modified | redhat-SADP |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 20, 2026 | Initial Analysis | [email protected] |
| May 19, 2026 | CVE Modified | [email protected] |
| May 19, 2026 | CVE Modified | CISA-ADP |
| May 19, 2026 | New CVE Received | [email protected] |