CVE-2026-8090

Description

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.

Overview

State: PUBLISHED
Assigner (CNA): mozilla
CVSS severity: high
CVSS score: 7.3 / 10
CVSS vector: AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Effective score: 7.3 / 10 HIGH source: CNA overview
CWE(s): —
Reserved: 2026-05-07
Published: 2026-05-07 14:45 UTC
Last updated: 2026-05-08 14:19 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/8xxx/CVE-2026-8090.json
Linked Threat: CVE-2026-8090 — CVE-2026-8090

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-05-07 13:16:13 UTC
NVD last modified: 2026-05-08 20:08:50 UTC
NVD CVSS v3.1: 7.3 / 10 HIGH source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Exploitability subscore: 3.9 / 10
Impact subscore: 3.4 / 10
EPSS score: 0.0002 (probability of exploitation in next 30 days)
EPSS percentile: 6.08% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD-assigned CWE(s): CWE-416 (differs from the CNA list above)

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-28361
Assigner: mozilla
Published: May 7, 2026, 12:45:04 PM
Updated: May 8, 2026, 12:19:00 PM
EUVD base score (CVSS 3.1): 7.3 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
EUVD-reported EPSS: 0.0200
Vendors: Mozilla
Products: Firefox

ENISA description: 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.

EUVD references (6)

Affected products (2)

Vendor	Product	Versions	Platforms
Mozilla	Firefox	`115.35.2` (unaffected), `140.10.2` (unaffected), `150.0.2` (unaffected)	—
Mozilla	Thunderbird	`140.10.2` (unaffected), `150.0.2` (unaffected)	—

Affected products — CPE 2.3 (4) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*

Vendor references (6)

References embedded in the original CVE record by the assigning CNA.

MITRE references (6) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

Web references (10)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

http://www.mozilla.org/security/announce/2026/mfsa2026-44.html rapid7:www.mozilla.org
http://www.mozilla.org/security/announce/2026/mfsa2026-42.html rapid7:www.mozilla.org
http://www.mozilla.org/security/announce/2026/mfsa2026-40.html rapid7:www.mozilla.org
http://www.mozilla.org/security/announce/2026/mfsa2026-41.html rapid7:www.mozilla.org
http://cwe.mitre.org/data/definitions/416.html rapid7:cwe.mitre.org
https://attackerkb.com/topics/CVE-2026-8090 rapid7:attackerkb.com
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-28361 rapid7:euvd.enisa.europa.eu
https://www.cve.org/CVERecord?id=CVE-2026-8090 tenable:www.cve.org
https://nvd.nist.gov/vuln/detail/CVE-2026-8090 tenable:nvd.nist.gov
https://www.first.org/epss/ tenable:www.first.org

NVD-tagged references (6)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://bugzilla.mozilla.org/show_bug.cgi?id=2034352 security@mozilla.org Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-40/ security@mozilla.org Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-41/ security@mozilla.org Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-42/ security@mozilla.org Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-43/ security@mozilla.org Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-44/ security@mozilla.org Vendor Advisory

Remediations (16)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Microsoft and Adobe Patch Tuesday, February 2026 Security Update Review

web:blog.qualys.com

Microsoft's February 2026 Patch Tuesday focuses on closing security gaps that attackers could exploit, reinforcing the importance of timely patching in enterprise environments. Here's a quick…

2026-05-23 21:08 UTC
Security updates for Adobe Acrobat and Reader

web:helpx.adobe.com

Security updates for Adobe Acrobat and Reader Last updated on Apr 14, 2026 | Also applies to Adobe Acrobat

2026-05-23 21:08 UTC
Security Update Guide - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-23 21:08 UTC
CVE-2026-8090 - vulmon.com

web:vulmon.com

Vulnerability details of CVE-2026-8090 CVE-2026-8090 - Use-After-Free Vulnerability in DOM Networking Component Across Firefox and Thunderbird

2026-05-23 21:08 UTC
Microsoft February 2026 Patch Tuesday fixes 6 zero-days, 58 flaws

web:www.bleepingcomputer.com

Today is Microsoft's February 2026 Patch Tuesday with security updates for 58 flaws, including 6 actively exploited and three publicly disclosed zero-day vulnerabilities.

2026-05-23 21:08 UTC
February's Patch Tuesday release fixes 59 flaws ... - Computerworld

web:www.computerworld.com

Each month, the team at Readiness analyzes the latest Patch Tuesday updates from Microsoft and provides detailed, actionable testing guidance. The company's Patch Tuesday release for February ...

2026-05-23 21:08 UTC
February 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft's February 2026 Patch Tuesday addresses 59 CVEs , featuring six exploited vulnerabilities, three of which were publicly known, and five Critical vulnerabilities.

2026-05-23 21:08 UTC
Microsoft February 2026 Patch Tuesday Fixes 50 ... - LinkedIn

web:www.linkedin.com

Microsoft has released its February 2026 Patch Tuesday security updates, fixing a total of 59 vulnerabilities across Windows, Microsoft Office, and core system components. The update includes ...

2026-05-23 21:08 UTC
Patch Tuesday: February 2026 Latest Patch Updates & Breakdown

web:www.manageengine.com

Unfold what this Patch Tuesday has in store for you Patch Tuesday, the unofficial term for Microsoft's scheduled security fix release on every second Tuesday of a month, has been a constant topic of discussion ever since its inception. Upcoming Webinar May 14,2026 11:30 EDT & 6:30 a.m. GMT Agenda of the Free Patch Tuesday webinar A complete breakdown of all the latest Patch Tuesday updates ...

2026-05-23 21:08 UTC
Patch Tuesday - February 2026 - Rapid7

web:www.rapid7.com

Microsoft is publishing a relatively light 55 vulnerabilities this Patch Tuesday, including six zero-day vulnerabilities already exploited in the wild.

2026-05-23 21:08 UTC
Security Advisory Bulletin 064 | Ubiquiti Community

web:community.ui.com

Published: May 21, 2026 Updated: May 22, 2026 Version: 1.1 Revision: 1.1 Summary 1 of 5 A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection. Affected Products: UniFi OS Server (Version 5.0.6 and earlier) Mitigation : Update your UniFi OS Server to Version 5.0.8 or later ...

2026-05-26 02:49 UTC
CISA Warns of Exploited Microsoft Defender 0-Day Flaws

web:cyberpress.org

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added two actively exploited Microsoft Defender vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, issuing an urgent remediation directive for federal agencies with a due date of June 3, 2026 .

2026-05-26 02:49 UTC
Microsoft Patch Tuesday March 2026 - 78 Vulnerabilities Fixed ...

web:cybersecuritynews.com

Microsoft released its March 2026 Patch Tuesday security update on March 10, 2026 , addressing 78 vulnerabilities across Windows, Microsoft Office, Azure, SQL Server, and .NET. The update includes one actively exploited zero-day vulnerability and multiple Critical-rated flaws demanding immediate attention from security teams. The most urgent fix this month is CVE - 2026 -21262, the sole zero-day ...

2026-05-26 02:49 UTC
March 2026 Patch Tuesday: Updates and Analysis | CrowdStrike

web:www.crowdstrike.com

Microsoft's March 2026 Patch Tuesday addresses 82 CVEs , featuring eight Critical vulnerabilities.

2026-05-26 02:49 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-05-26 02:49 UTC
Patch Tuesday May 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-05-26 02:49 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-8090.json.

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              "baseSeverity": "HIGH",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
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