CVE-2026-8948

⛔ critical

Summary

Same-origin policy bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

CVSS Score

9.1

Critical

EPSS Score

0.4

Exploit Probability

Published Date

2026-05-19

First Seen: 2026-05-20

📊 Relative Risk Intelligence

This CVE is High Risk - more severe than 87.6% of all 360,548 vulnerabilities in our database.

#44,729

Top 25% most severe

Severity Percentile

🎯 CISA SSVC Assessment Updated: May 19, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

YES

Can be exploited automatically

💥 Technical Impact

Total

Complete system compromise possible

🏆 Discovered By

satyamasd

SSVC data provided by CISA

Last Modified 2026-07-15

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CWE IDs (Weakness Types)

CWE-942 CWE-79

📦 Affected Products 2

Vendor	Product	Status	Affected Versions
mozilla	firefox	Affected	< 151.0.0
mozilla	thunderbird	Affected	< 151.0.0

🔗 References 6

https://bugzilla.mozilla.org/show_bug.cgi?id=2038803

Permissions Required

https://www.mozilla.org/security/advisories/mfsa2026...

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026...

Vendor Advisory

https://access.redhat.com/security/cve/CVE-2026-8948

https://bugzilla.redhat.com/show_bug.cgi?id=2479850

https://security.access.redhat.com/data/csaf/v2/vex/...

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-84118	🔶 medium	5.4	0.2	Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderb...	2026-09-01
CVE-2026-84119	⛔ critical	9.6	0.3	Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Fire...	2026-09-01
CVE-2026-84120	🔶 medium	5.4	0.2	Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ES...	2026-09-01
CVE-2026-84121	⛔ critical	9.6	0.3	Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefo...	2026-09-01
CVE-2026-84122	🔶 medium	5.4	0.2	Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ES...	2026-09-01
CVE-2026-84123	⚠️ high	8.8	0.2	Privilege escalation due to use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 15...	2026-09-01

These CVEs affect the same products