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Firefox CVE-2026-6782

| EUVDEUVD-2026-24123 HIGH
Information Exposure (CWE-200)
2026-04-21 mozilla GHSA-rm28-r39x-h3x2
Information Disclosure Mozilla Red Hat Suse
High
Disputed · 7.5 NVD
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Severity by source

Sources disagree (Low–High)
NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SUSE
HIGH
qualitative
Red Hat
3.4 LOW
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

7
Patch released
Apr 29, 2026 - 02:30 nvd
Patch available
Re-analysis Queued
Apr 22, 2026 - 00:22 vuln.today
cvss_changed
Analysis Generated
Apr 21, 2026 - 18:24 vuln.today
CVSS changed
Apr 21, 2026 - 18:22 NVD
7.5 (HIGH)
EUVD ID Assigned
Apr 21, 2026 - 13:15 euvd
EUVD-2026-24123
Analysis Generated
Apr 21, 2026 - 13:15 vuln.today
CVE Published
Apr 21, 2026 - 12:41 nvd
HIGH 7.5

DescriptionCVE.org

Information disclosure in the IP Protection component. This vulnerability was fixed in Firefox 150.

AnalysisAI

Unauthenticated remote attackers can obtain sensitive information from Firefox's IP Protection component prior to version 150 via network-accessible requests with low attack complexity. The vulnerability leaks confidential data (CVSS:C=High) without requiring user interaction or special privileges, affecting all Firefox installations below version 150. Mozilla has released a vendor-confirmed patch in Firefox 150. No active exploitation (CISA KEV) or public exploit code identified at time of analysis, though CVSS vector indicates trivial exploitation conditions (AV:N/AC:L/PR:N/UI:N).

Technical ContextAI

IP Protection is a Firefox privacy feature designed to mask users' IP addresses from tracking networks. This vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affects the IP Protection component's data handling, allowing disclosure of information that should remain confidential. The affected product is Mozilla Firefox versions prior to 150, as identified by CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*. CWE-200 indicates a failure in access control or data sanitization that permits unauthorized parties to retrieve sensitive data. The CVSS impact metrics show High confidentiality impact (C:H) with no integrity or availability impact, meaning the flaw exposes protected information but does not enable data modification or service disruption. The root cause class suggests improper output handling or insufficient access validation in the IP Protection subsystem.

RemediationAI

Upgrade Mozilla Firefox to version 150 or later, which contains the vendor-confirmed fix for this vulnerability per Mozilla Security Advisory MFSA2026-30 (https://www.mozilla.org/security/advisories/mfsa2026-30/). Firefox typically auto-updates in default configurations; verify update completion via Help > About Firefox. For enterprise deployments using managed updates, prioritize deployment of Firefox 150 through existing update channels within standard patch cycles. If immediate upgrade is not feasible, consider disabling the IP Protection feature as a temporary workaround, though this reduces privacy protections and may not be acceptable for privacy-focused deployments (trade-off: vulnerability mitigation versus reduced tracking protection). Review Firefox privacy settings and audit network traffic from affected versions for potential unauthorized information disclosure. No firewall rules or network-level mitigations are effective given the vulnerability resides in browser application logic. Extended Support Release (ESR) users should verify their ESR branch includes the backported fix.

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Same weakness CWE-200 – Information Exposure

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CVE-2016-6415 HIGH POC
7.5
CVE-2013-7331 MEDIUM POC
6.5
CVE-2025-31125 MEDIUM POC
5.3
CVE-2025-11749 CRITICAL POC
9.8
CVE-2017-16894 HIGH POC
7.5
CVE-2017-11165 CRITICAL POC
9.8
CVE-2016-2388 MEDIUM POC
5.3
CVE-2016-1561 HIGH POC
7.5

Same technique Information Disclosure

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CVE-2013-2251 CRITICAL POC
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CVE-2017-5638 CRITICAL POC
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CVE-2025-24813 CRITICAL POC
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CVE-2015-1701 HIGH POC
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CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
8.8
CVE-2023-7028 CRITICAL POC
10.0
CVE-2017-0213 HIGH POC
7.3

Vendor StatusVendor

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed

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CVE-2026-6782 vulnerability details – vuln.today
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