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Mozilla Firefox CVE-2026-84134

| EUVDEUVD-2026-69082 CRITICAL
Information Exposure (CWE-200)
2026-09-01 mozilla GHSA-h34p-xgvr-mfg3
Information Disclosure Mozilla Suse
9.8
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
5.5 MEDIUM

CWE-200 disclosure-only flaw in a local backup feature implies AV:L and confidentiality-only (C:H, I:N, A:N); low-privilege local access assumed given undisclosed vector.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Sep 03, 2026 - 20:38 vuln.today
CVSS changed
Sep 03, 2026 - 18:37 NVD
9.8 (CRITICAL)
CVE Published
Sep 01, 2026 - 12:19 cve.org
UNKNOWN (no severity yet)
CVE Published
Sep 01, 2026 - 12:19 cve.org
CRITICAL 9.8

DescriptionCVE.org

Other issue in the Profile Backup component. This vulnerability was fixed in Firefox 155 and Firefox ESR 153.2.

AnalysisAI

Information disclosure in Mozilla Firefox's Profile Backup component, remediated in Firefox 155 and Firefox ESR 153.2 (Mozilla advisories MFSA2026-82/85/86/88). Mozilla provides only an 'Other issue' placeholder description, so the precise mechanism is undisclosed, but the CWE-200 classification points to unintended exposure of data handled during profile backup. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Exploit
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires interaction with Firefox's Profile Backup component; the CVE description gives no further preconditions ('Other issue'), so the exact trigger is unconfirmed. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals conflict sharply and should temper the headline severity. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: upgrade to Firefox 155 or, for the extended-support channel, Firefox ESR 153.2, per Mozilla advisories MFSA2026-82/85/86/88 (https://www.mozilla.org/security/advisories/mfsa2026-86/). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, audit your Firefox inventory to identify all systems running versions prior to 155 or Firefox ESR before 153.2, including BYOD and remote worker deployments if feasible. …

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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CVE-2026-84134 vulnerability details – vuln.today
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