Cyber Resilience

CVE-2026-8090

High

Published: 07 May 2026

Published
07 May 2026
Modified
08 May 2026
KEV Added
—
Patch
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CVSS Score v3.1 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
EPSS Score 0.0002 6.6th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-8090 is a high-severity Use After Free (CWE-416) vulnerability in Mozilla Firefox. Its CVSS base score is 7.3 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Drive-by Compromise (T1189); ranked at the 6.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.

CWE(s)
CWE-416

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1189 Drive-by Compromise Initial Access
Adversaries may gain access to a system through a user visiting a website over the normal course of browsing.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
Why these techniques?

UAF in browser DOM/networking directly enables drive-by client-side exploitation and arbitrary code execution via malicious web content.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

CVEs Like This One

CVE-2026-2769Same product: Mozilla Firefox
CVE-2026-0882Same product: Mozilla Firefox
CVE-2026-2758Same product: Mozilla Firefox
CVE-2026-2770Same product: Mozilla Firefox
CVE-2026-2764Same product: Mozilla Firefox
CVE-2026-2766Same product: Mozilla Firefox
CVE-2026-2797Same product: Mozilla Firefox
CVE-2026-2772Same product: Mozilla Firefox
CVE-2026-2798Same product: Mozilla Firefox
CVE-2026-2786Same product: Mozilla Firefox

Affected Assets

mozilla
firefox
≤ 115.35.2 · ≤ 150.0.2 · 128.0 — 140.10.2
mozilla
thunderbird
≤ 140.10.2 · ≤ 150.0.2

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SI-16 Memory Protection
addresses: CWE-416

Use-after-free exploits that achieve arbitrary code execution are blocked or significantly hardened by non-executable pages and ASLR.

References